does your untrained xp has an influence on your rewards? (in General)

If i train my exp i will raise my mpr and i will lower my rewards because so far i am unable to fight tougher opponents.

can i keep as is all my exp untrained to keep correct rewards?

If so, I will train in a few weeks when i will estimate that i can try better opponents...

nope, there is actually a virtual PR which is used for calculating rewards and includes untrained xp.

Yes your untrained experience is calculated towards your fighting PR.

saving up lots of experience (best tested when being a small character) will lead to getting lower fighting rewards (i have seen the proof of it)

Oh.

*trains exp*