Spring steel looses its temper with heat and changes to bendable.

I have a similar problem with my 38 which was shaved. It has electric windows and I have an option to roll down the window with the controller as well as pop the door. When the car sits, the battery draws down and the popper then only works if you press in on the door to release the latch pressure. I have a 40LB solenoid and have it rigged with a relay to get max pull.

You may want to try a counter spring like a throttle return spring to slightly reduce the door latch spring pressure. I was going to try to rig this and ended up going to the 40 LB from 30.

Good Luck.