Egt limited engine

[Wolf_Tm250]

Hello,
i am still a newbie of the wi... but i have the suspect it's an issue i could ask your advice for...

What would you do if you had an egt limited engine?

I mean, i still have boost (0.4 bar) to run with good turbo efficiency, but now i have skyrocket egt (950 C at valve exit = 1070 C at turbine inlet) at 2 bar and no det.

Any advancing of ignition timing ( to lower egt) gives me det.

Can I presume that:
- mine is end has det (cause it disappears when i retard ignition) ?
And that:
- i have my ppp way later than 14 deg atdc (cause my egt are so high) ?

So, afaik, my goal should be to fight end gas det... correct? So that i could advance a bit the timing to lower egt without having det.

For this purpose, what are your advices about wi?
Pure water, 50%meth?

Any other consideration or tuning advice?

Thank you...