Ok wait so you want thrash metal, but likely more modern (clean crisp recording) stuff and you don’t like long songs or too many instrumental sections? Is that correct? (you are like my complete opposite haha!)
…or are you saying that you want really ‘clean’ vocals rather than muddy or dirty vocals?
I should be able to help here (thrash is my baby) but I just need some clarification 
Well. Until I hear back from you, you can browse here I suppose . . .
Thrashology 101: The Joy of Thrash
Edit: just re-read your guidelines. IMO some of them are contradictory, but I’ll start working on a list for ya