just wondering how accurate the compression calculations that 440 source has listed for there stroker kits.

I'm building a 440-512 kit 30 over (505) with the .17 dished pistons and trickflow heads.
They say I should be at 10.6. With pistons .015 in the hole. I went 0 deck and I'm trying to figure out what my compression is going to be and I'm having a hard time. Even when I enter there numbers in summits compression calculator get a lot higher numbers than what they say. Any help is appreciated. My goal was 11.1 or so. Thank in advance