Try turn watts or joules down to where it is not rattlesnakeing. You may be pushing too much power for the temp chosen and it is pulsing to stay at temp.
Tc is useless to me since i like a hotter vape than i guess the average. Even at 600 degrees vape came off too cool for my taste. Plus i dont like that xut off sensation i get a second into the hit on tc.
I used to only vape in TC but over the last couple months I've started to drift away from it. I started using RDA's lately and in that case it really comes in handy.