Hun, my son was EXACTLY the same. I bought the 7+ and 10+ months jars and blended them so they were smooth so he was getting bigger quantities.
He was always fine with rice cakes, but other things he just gagged and be really really sick, it was really distressing.
One time though my mum gave him a digestive biscuit, and he loved it so much and from there he seemed to start chewing properly.
One day I noticed he was chewing his smooth food and so just started offering it normal without blending and he was fine. he still had set backs and refused to eat lumpy things sometimes, but generally he was ok.
At about 10.5 months he was fine with normal food. He is really fussy though.
He now eats bananas, sandwiches, lumpy food jars, oaty bars, pears etc.
His diet is pretty limited though as most things he tries that we eat he doesn't like!
Just keep going hun, follow his lead. He will eat lumps when he is ready. They defo all get there in the end. Just offer him normal food, but blend it up first so he can get used to the stronger tastes etc
xxxxxx