...not much coolant in the Nytro to begin with...particularly under boost I'd leave the radiator...adding coolant volume in addition to the radiator (edge coolers/double pass Ucooler, etc.) would help alot. The more cooling the better...
Took my rad and fan out, but I am running a CR tunnel with their u cooler and no heating issues at all. We packed into a lodge pulling a sleigh in april and no heating issues then either.