Help Me Cool Down

Help Me Cool Down

IMHO, you answered your own question.

T56MaxTorq said
It will stay cool under boost but if it comes to a sudden stop and idles, temps climb

My assumption to what you have said is that while running at other than idle rpm it cools just fine.

T56MaxTorq said
had to run a underdrive crank pulley and that lowers my fan speed

Get the fan speed up.

I am not a fan of shrouds but if it is working at speed it is not blocking too much air flow,
Only change 1 thing at a time to see what the root cause of the problem is.

My gut is fan speed