About your question of keep it stock or overclocking, I rather underclocking them cut the blue wire from the fans and place the miner in a horizontal position instead of vertical so the chips on the boards also stay in horizontal position and that might help to keep them from falling easily.
Are you sure about the horizontal positioning? By some laws of physics and my basic understanding of it, while miner is in vertical position, all heatsinks have the same sag and gravity is pulling them downwards at angle of 90°. And that may not be perfect, but I think it is best to stay in that position since if you put the miner horizontally, half of heatsinks are in perfect position (gravity is pulling them towards chips and that would make them almost impossible to fall off), but half of them are in worst position as they are pulled downwards (away from chips) at angle of 180° and that would make them (by some raw and stupid calculation) 50% more likely to fall off than in vertical position.
Please, do correct me if I am wrong in any way!
Friend Favebook, I already did and I'm really sick of "copy and paste" answers by someone called Jessica L. who is in charge of technical department.
Yeah, I understand you... I hate those answers too.