DD#1 loved her solids from 6mths - but DD#2 wasn't really interested until she was about 10mths old. They are all different

I tried BLS - but she would choke. But she also refused to eat from a spoon!
I persisted with the foods she was happy to feed herself that didn't make her gag.

I wouldn't decrease his bottles if I were you, because he needs it.
Try not to worry too much, he WILL eat in his own time