Just wanted to add you should be able to do this with any firmware that allows custom voltage and frequencies, so if you had 13.4v/545 frequency it should be the same as the stock S19 J pro 104T, I know you can do this through Luxos command line through excel, not sure about other firmwares
@VoskCoin is your 90T running well at 104T?
I had a board go down the other day and identified a bad chip.
I was running some tests on my friends 104T J pro and his miner has different chips. I realised his miner runs at a higher voltage for the same frequencies. If I used the Eeprom from his, and had the higher voltage then perhaps I would not have had any issues. If I were to do it again knowing what I now know, I probably would have bought the Altair tech control board because from what you showed it auto detects the chips and should provide the correct voltage. I’m going to copy his boards eeprom over to mine just to see how it runs