The highest value for injector is around 440cc... so there is no way to set up 630cc injectors without retune the fuel maps...
That is not true. You just have not found TEMIN.
I have successfully run 1600cc injectors by only changing FGAT0, TEMIN and TVUB.
Anyway Deka's are shit, it's going to always misfire on idle with them.
Sorry, I have no interest in sharing this info - mainly because of everything you are doing is lightyears behind to where I have developed this ECU.
And I am planning to make all that knowledge and custom code available to the masses.