Why am I coughing so much?

Guys, can I get some opinions on this situation? I vape mostly HHC and HHC-P, but it makes me cough like a motherfucker about ½ of the time. I'm using a Drag 5 with a TFV9 tank and Ccell ceramic coils. I vape on TC mode at 250⁰. I have 2 separate tanks and they both do the same thing.... Leak.

It's not terrible at first, but like all leaks, it gets really bad.

Is it that I'm doing something wrong somewhere? Everything is nice and tight yet it still always finds a way out the bottom and clogs pretty bad. I always end up having to completely disassemble the tank and clean everything with iso.

Can anyone tell me why I cough so fucking hard? Is it that the clog is fucking up the air flow and it's a particle related thing with the lungs, or is it a shit set up? I've never really been taught/learned any "proper" education on this and I'm only using distillates about 6 months and this has always happened with these tanks? Is it too much terps (10%) maybe?

Any help or advice in getting this coughing thing under control would be GREATLY appreciated. For my health and my fuckin sanity. And, if someone can tell me what's going on with the leaking I would again, be very grateful 🙏.

TIA