Hi Gisele! Welcome!
I post as cherobanne on BC too although I've been a bit bad recently and reading more than posting
Definitely not too late to convert!
Bamboo takes around 10 washes to reach full absorbancy so if they're new nappies perhaps that's why you haven't noticed much difference?
I'd agree with the PPs re the handiness of pockets. I'd really recommend bumgenius and fuzzi bunz. (Wonderoos are also very reliable with us but not as neat a fit, but then my LO is only 8 months)
Two parts are definitely best for night time IMO. Your bumble would be great (might need boosted) as it's already fleece lined. Wool shorties would keep your LO dry and wouldn't leave any red marks. (Wool is much more breathable than PUL too) If you don't fancy trying wool just yet you could try a fleece wrap.
HTH a bit,