FFT, glad things are going well with the nappies, how are you finding the Wambamboo, loads of people prefer them to the Bamboozles.
Alocin you have recieved some really good advice about the Bamboozles, when I started to use them I was also shocked at how wet they were at a change compered to an Original Tots, however as they are slimmer but more absorbent then I guess this makes sense as there is less fabric to soak up the wetness than in an Original Tots. However all bamboo nappies take around 15 washes to reach their peak absobency, also are you folding the booster to over where your LO needs it the most? My other thought is it may be detergent build up if you have washed them a few times or more. Detergent build up can reduce absobency and cause skin irritation, I only use about half the normal ammount of detergent in my nappy washes, there should be no bubbles in the water when you do the final rinse of the nappies, if there are you will need to put your nappies on for a couple of washes (when they are clean!) without any detergent and this will "strip" them of any residue, just continue to wash them untill you stop seeing bubbles in your machine.
Babydriver, we used a Bumbo with DD and it was one of our savings, she was a very unsettled baby, would not lie down flat or even propped up in a boucy chair or swing, I spent all my time carrying her around, which is fine when you are on the go, but when you just want to sit down and have diner at the table with the rest of the family it can get a bit of a nightmare. As she always wanted to be sat upright we bought a Bumbo mail order and it arrived the day before we went on holiday (she was just under three months) and when we sat her in it she was sooooo happy, just sat there looking around, that we took everything out of our already packed suitcases to jam the Bumbo in to take away with us (good job it was light so we didn't have to pay extra baggage charge!). We got loads of use from it, if we were sat at the table we would put the Bumbo on the table (any HV or A&E nurse would have had a fit, but it felt safe as she was obviously never left on her own up there!) and she would just sit there watching us and smiling and joning in with the family as she had never done before. I think you always think "is this going to be a waste of money" when you buy baby things, for us the Bumbo was the best thing we bought and the swing etc were a waste of money, for others it will be the other way round. They are often up for sale on the MN sals board so it may be worth keeping and eye out for a local one so postage won't be involved or put up a wanted ad on the wanted board