Little lamb size 1 are for 3-9 kg so I think you got your money's worth out of them. I got the LL OSFA and do not even do up on my DD who is 12.5kg and 2.4 yo. I have put them by for DS due in 4 weeks. He will not mind the pinkness.
I think if you have such a heavy wetter you may struggle with the eBay cheapies, but would recommend you still try just one. Size wise they would do fine. DD is on the middle fastenings, so room for growth and would fit a slimmer child too. I use 1 of the supplied microfibre inserts with 1 LL bamboo booster, and they last a couple of big wee's, although I try to change after one as she is weeping less frequently. Good on poo containment, and I like the fleece lining as it keeps her bum dry. Only used in rotation, so about 5 times so far, and she loves it. I am ordering one at a time as postage is free, and it is a cheap way of getting my fix.
I have not tried any of the other nappies you mention.
I have LL bamboo, totsbots bamboozles, totsbots easyfit, Fuzzis and Alva baby 3 eBay cheapies, and actually prefer the Alva for daytime.
I will buy some size 1 LL bamboo when next on offer. Was tempted by the microfibre, but prefer my pockets for day.