So im sittin on 19x10.5 in the rear with 275/30/19.

My previous tires were wearing alot more on the inside but for the most part pretty even.

My concern is for launching the car from a stop am I losing grip since more tire is touching the paving on the insides? Then again I do need to have good grip around high speed turns.

BTW the coupe is not lowered.

 

An alignment will alwyas help since you are putting a heavier wheel on.

 

have some friends sit in ur car and look at the back wheels
the car will get lower and ull get some camber
thats just how it is,