Thanks for the reply, I'm glad you confirmed it should work because it made me go back and take a second look at it from a fresh start.
I'm leaving this here for anyone else that has this recurring problem and wants a simple fix, as so far it seems to be completely fixed/solved.
The problem I had; there were similar codes further on down the list that I had missed with the same code numbers (e.g. P1410) but different values/parameters. So I had disabled P2441 that had valve stuck closed bank 1. BUT, further down where I had not seen, there was also P24441 that would trigger with valve stuck open bank 1.
So I trawled through all the DTC's for any SAI related codes and disabled all of them, re-flashed the ECU and so far... no codes!
So, for anyone with a similar issue with a SH or similar model, it can be done.
I bought this cable as Tactrix is no longer an option:
https://www.amazon.com/dp/B0BXGDHZGL?_e ... sl-20&th=1They provide their own drivers etc. and warn against using their cable without their drivers. So once I got the cable, I followed the link they provided and downloaded ECU Flash and drivers from them. Plugged into the ECU and loaded the ROM - I used the Def for 2007+ CAN BUS Subaru's which seemed like a good generic one.
disabled all the codes that related to the SAI, test flashed and no errors came up so I went for it and it was successful.
Goodluck to anyone else that encounters this problem, I hope you find this solution.