Yeah im not going to be running timing anywhere near 19 degrees. Your AFR doesnt seem too far off from what ive read though.

Whats your motor setup?

 

The one i used last year was a stock ls1 2002 with a mild cam (dont know what it was).
Had a Garrett GT42 turbo with 0.65 bar (9.4 psi) boost. 60 lb injectors and two bosch pumps and E85
Same engine has been used a couple of years with boost in my track-car. im amazed how much beating it took before it died.
EDIT: it didnt die because of boost. The waterpump stopped and the engine overheated. A piston got stuck and crushed everything.

My new setup is the same but with forged piston and rods with ported 317 heads and 9.8:1 compression. Dont know how that will work yet but i hope it will be reliable as well.