Mel - we use BBH. ANd they are great.

I will change them every 2-3 hours on DS because he seems to soak them well - with both the long and short booster. I can often touch the outside and they are wet).

I used microfleece liners i bought from spotlight and cut up myelf - have about 50 liners for $5.
They are extgremely easy to little squirt the poo off the fleece compared to the bamboo, if some gets onthe BBB then they will sun out the stains. Bamboo is a wonderful natural fibre.

Also the liner helps keep bubs bottom dry from the wee.

I would say you have plenty of covers! I only have 3 pul and 1 wool cover for DS and 2 x woolies for night times.

I dont fold my BBB over into newborn as i find it too bulky but the PUL cover will contain anyloss.

Also i find that medium covers are better fit than the smalls over the BBB (i have always upsized).