i have a 93 oct. race tune on my horse and i just ordered some torco accelarator treatment/additive, from what i've seen people using it are increasing the timing, i've seen 4-6 degrees advanced. Sound good to you, i'm using a predator
If you're using the entire can per tank of gas, I'd still start out at a lower timing level and work upward if you don't ping/detonate. 6* sounds like a bit much.
The Torco gives an octane increase figure on the can, but I'd take that with a grain of salt....
I did for a few months since I'm getting 89 octane versus 91 octane from work. I got great results and wouldn't hesitate to recommend it over all the other brands I tried (NOS, Lucas, etc).
I guess I just got tired of spending $25.00 a can (everything costs more here)