hey recently i have bought 2 prevuilt coils um using a drop solo 1.5 rda i fnt know why but these 2 new coils are developing hot legs but when i changed to my previous coil it fixed instantly whats wrong with the coil i have tried strumming tighten the screws and all other options from reddit and all more cotton less cotton high waat low waat if i press the fire button on my previous coil it creats a lot of smoke and dry up the cotton without any hot spots but this new coil is getting hotter into leg side if i press the button for even 4 sec whats the problem there? Can anyone solve it?