I'm sorry, what exactly is a "Nautilus Triton"?
Aspire makes many tanks however I don't believe they make any "stock" TC coils (I could be wrong, I don't keep up on replaceable coil products).
When I bought my Nautilus tanks there were: 1.6 and 1.8 ohm stock Aspire coils available (NOT Ni200)
When I bought my Alantis2 tank there were more "stock" coils available, however none were Ni200.
When I bought my Triton tank again none of the Aspire coils (uses same coils as Atlantis1/2) were TC enabled (Ni200)
SO, we don't know what actual tank your using OR do we know what brand of coils your trying to use.
I bought some 'Vapor Shark' after market Ni200 coils for my Nautilus tanks, they read much higher than what your reporting however set to 10-15J and 380F they vape just as well as the "stock" 1.8ohm Aspire coils - even better as the experience is consistent vape to vape.
Ditto for the Atlantis2 and Triton. The VS Ni200 coils are 0.15ohm. The first time I fired the Atlantis2 I was in heaven! More flavor than I'd gotten out of any tank previously. As for the Triton? While I've coaxed some decent vapes out of it at normal Joules and Temperature settings my copy of the tank simply does not work for me and I'd rather futz with my Lemo2's than it.
You did set and lock in the resistance of the coil when it was COLD (room temp) right? On YiHi chips in TC mode the Joules sets the ramp and regulation power. On dual coil build and large ID builds (where I wicked to much) I may venture into 35J but it is rather rare. < 30J if not < 20J ought to be enough to fire a aftermarket VS Ni200 coil. While personally I've had good luck with VS coils I've heard some people don't and I'm glad I ventured away from the hit/miss world of store bought coils and into RTA's.