2.76 open to 3.55 Sure Grip...expectations too high?

Okay, my rear tires are 245/60R15, which works out to 26.6". I'm gonna get after doing a compression test later today and will report back the results.
So far I'm doing pretty good; I got the tires right on, but overstated the intake duration @.050 by 3 degrees, which will not affect the Ica; So all my calcs are spot on. I even called the shift rpm within 100rpm. So, on a roll;
you wanna hear about my Theory of the Enclosed Earth System? Go to; AJ's Opinion; the shape of the Earth in the Search bar..
https://www.forabodiesonly.com/mopa...he-shape-of-the-earth.480916/#post-1973272310