For my particular setup each Vein ore miner is producing 680 ore per minute.

I Tinkered with it prior to update 2 & that was the best I could Produce, I haven't tinkered with it since update 2

how increases their speed to match T4 belts?

No rush, my dude. As a fellow programmer, I know how long it can take to get back into the flow of things.

it's going to take some time for me to remember how to mod this game, I'm in the process of getting the tools updated and then I'll start trying to fix my mods, please be patient.

Looks like this is working fine un update 2, i got problems with others, so i can not test it fully

Does this increased output shorten the ore vein's life?

I don't mean to be a pain, but could you give us a quick description of what this changes? I'm guessing it just increases their speed to match T3 belts, but a confirmation would be greatly appreciated.