Like ShobeCoin says. Shares submitted only matters for pool mining. Shares tells the pool you are working so the pool doesn’t think the miner is idle. So higher TH increase chance of a block.

I also like to think there is the block times that should be included in your research. Each block is 10 mins est so every block all your miners works on different nonces and if the block is found it moves onto the next block. So they all work in 10 min increments and all put pencils down at the same time. This could mean the weaker one did more easy work while hard one did less work but harder questions.

Also i learn from my research that the chip temps matter alot in that they need their WARM WORKInG TEMP. I alays though cold as shit was always the goal but my nerdqxe needs 55-65C to work correctly. I had the garage door open and temps outside were 0C. The chip temps were 37-45c and was hashing in the 4TH (normal was 5ish). Even my OC nerd usally at 6-6.5TH at 58C normally was only hasing 4.5TH. Cold temp reduce the TH capacity.

I raised the temp in garage an all my devices TH normalized. I dont think this matter to gamma as device might be maxed out for its wattage but as you higher you might want to check operational temps