OK. So you want slim fitting, effective nappies. They don't need them to be cheap or incredibly quick drying and you have a mediumly built DD who is 8mo.
Slim fitting nappies tend to be either pocket nappies or bamboo (which is thinner fitting compared to it's cotton equivilant).
If you want something that is definitely going to be effective then you really would be best looking at a two part, shaped nappy (i.e a shaped fabric nappy that doesn't require folding which has a waterproof 'wrap' put over the top of it).
Pocket nappies tend to be less reliable and can give you a lot of leaks. The mothercare nappy you have is known as a 'pouch nappy'. A pocket nappy has two layers - one waterproof layer and one fleece layer there is an opening at one end so that you can place an 'insert' between the two fabrics and that is what does the soaking up. Because the insert comes out of the actual nappy it makes for a very fast drying nappy but because you effectively only have one barrier against leaks it can be less reliable than a shaped nappy - espeically if the cut does not suit your DCs shape. To be successful with pockets you either need to be lucky and find the right one first, or try several to see what suits you best. Problem for you might be that your next DC could be a totally different shape and not suit the type you bought for your first. If you choose to go with a pocket system I would strongly recommend you get a sized version and not a birth to potty. The birth to potty versions may not last for more than one child. If the older child stretches the leg elastic too much it may not hold in leaks for a newborn when the time comes. Obviously, sized nappies will cost more as you need to be different sizes but they will see less wear and should last longer. You can use all sorts of things for inserts in pocket nappies (anything you can fint inside that will be absorbant will do). Purpose made inserts are what most people go for. I would strongly advise you to avoid anything made from microfibre if you have a humid environment (I have helped 3 people from your part of the world who had problems with microfire nappies). Microfibre just seems to never dry properly in humid conditions, it feels dry, but it isn't and this leads to a very smelly nappy a short way down the line! Other inserts are made from Hemp (which will take a long time to dry and will dry stiff - it also will need many (5+ minimum)'prewashes' before it becomes absorbant enough to use. Your best bet for an insert would be bamboo - so look for those. If you want to try pockets then look out for fuzzi bunz. Avoid anything with velcro fixings if you want it to last for years. You'll need to have a bit of a search to find bamboo inserts though as most are hemp and microfibre.
That said, I think you'd be far better off with a shaped, two part system. The wrap part is easy - get some motherease wraps! They are bombproof for most people. They come in Rikki (velcro) or Airflow (popper fit) - I'd go for the airflow as it will work even when your DD goes through that short-lived chubby leg phase they all tend to go through. The airflow can be adjusted around the legs and wasit to give a good fit. It is also a breatheable wrap. The rikki is good though if you really don't fancy poppers but poppers are great and easy to use.
Good nappies to look at for underneath the wrap that fit your criteria would be Bambinex (a slim fitting, bamboo, sized nappy but with velcro fixings), Motherease one size (slim fitting but one size, available in bamboo or cotton), Swaddlesbees organic (they also do a pocket nappy so make sure you look at the right thing), Motherease Sandy's (available in cotton or bamboo - excellent nappies). The last three are popper fit and this makes them a slimmer fit as they don't have big velcro bands across them. The Sandys and swaddlebees are not incredibly quick drying but they are an excellent nappy, very absorbant and give a very good, comfortable fit - maybe you could buy a few extra to make up for the slow drying time as I think it would be worth it. Many people do not like the shape of the motherease one size - or find it not absorbant enough (this is refelcted in the secind hand price IMO - sandys are expensive even second hand MEOS are cheap) If you go for Sandy's then use the AIRFLOW wrap as it suits it better.
Fleece liners would be a good bet if it is hard to source cloth nappy stuff in your area - you can reuse them and they keep your baby's bottom dry. There is no need to soak the nappies or use any other cleaning agents other than your normal powder. Don't use softener.
swaddlebees organic
sandy's
Motherease One Size (MEOS)
airflow wrap
rikki wraps
close up photos of a pocket nappy