Full flash question

erm.. ok where do i start , ...

ok my question is actually a reception tx-power tuning ..
when a phone is tuned for tx-rx , these values are saved to the phone , when u do a full factory reset it upsets the tx power levels etc ...
my question is if i did a full factory reset on a phone and used one of my full flashs (on the sametype of phone i knew had good reception ) will the new tx tuning values be in effect ...??
they are stored in the eprom right ?

i would still need to rewrite the imei as the fullflash will overwrite the imei right?