i think its pretty evident that your car’s problems go deeper than just spark plug gap… if youre not holding pressure in the intake, you have big leaks, whether you can hear them or not. use the smoke machine like onyx said. dont end up like me 
‘spark blowout’ or a similar misfire at high rpms / at full boost can be caused by boost leaks. you apparently have plenty so i would say that is your biggest problem. i would start with that and get that out of the way before you dive any deeper. its the simpliest (in anything but a z) step to take. take care of them before they blow up your car and change your name to woodrow II.