the best way to improve the life of your passthrough is to reinforce the cable that comes out of the cherry with heat shrink or electrical tape. You can't see the cherry, but if you don't do this then the cable will inevitably get ruined by being bent and twisted. Ruined two passthroughs this way before i figured it out.
Can you post a pic on how you did this? I just got a replacement passthrough... worked good for 4 days, then now starting to act up. It doesn't draw smoke half of the time, and when it works, it continues to draw smoke for 3 seconds after I am done taking a hit. It makes my atomiser very hot.