Sorry cant help you but will be interested to hear other suggestions. We too are using a tangle teaser, its fine for my youngest who has long wavy hair but my eldest has very thick hair and loads of it, the teaser only brushes the top layer of her hair.
I swear by bamboo or wooden brushes now. My hair has always tangled really easily but they don't hurt and untangle really well. I had a bamboo one from Tkmaxx before my dog ate it and now have a Woodyhog by Kent.
Yes, I was in Tkmax earlier looking for a replacement bamboo brush but they only had the minis. The one I'm looking to replace was nearly paddle brush sized as the woodyhog is quite small (although that might be better for an 11 year old)
The bristles are wood so they don't bend but are smooth. I don't know if they are actually better for the hair but mine was a tangled mess after too much bleaching last year and the wooden brushes really helped. I would recommend Tkmax if you live near one as they were only £4-5 in there.