IMO, anything more than the 1-step upgrade (for weight saving) is a waste of time and money as it's not worth the weight and power draw. 7 and a half minutes should be enough to get back to somewhere but, to be honest, the point is more the following : if I get to the point where my cockpit canopy goes, I am invariably dead a few seconds later anyway. I find once the shields have collapsed, any foe worth his rating (ie. Elite) will start taking out your systems within a few seconds of sustained fire, and whether it's your cockpit going, or your thrusters, or your power supply - it's all irrelevant after that. You're dead already. For lesser foes, it's not such a worry.