i found a bug that allowed me to go almost 400 thousand meters down, when you press restart the shield doubler stays applied from the previous drop and you can double it again and again by restarting, so my strategy was to set all slots but one to heat resistant plates and get the maximum amount of heat resistance, then just double the pressure with a few rounds and let it drop.
Amazing game all in all, i find these sorts of games fun and addictive, right up my ally, Great job!:)