interior rear panel damage

[plugger340]

This panel was badly warped at the top so I heated it with a heat gun to bring it back into shape but it turns out the side also needs to be straightened.
With all the problems that I’ve been having with this set I wish I had bought repops or fixed my old ones instead of buying this used set but it’s too late now. I don’t want to heat this warp only to discover that the old warp on top has reformed. Any suggestions on how to heat things up and get everything back in line?
Should I install it on the car and then heat it?
Thanks in advance for your help

 

[69FBCuda]

Could always use ice packs on the completed parts.

 

[plugger340]

Could always use ice packs on the completed parts.

Sorry for the delay but I was on holidays. What do you mean about using ice packs?

 

[69FBCuda]

cool down the areas you dont want to re-warp

 

[plugger340]

cool down thd areas you dont want to rewarp

Thanks