I was only running flammable denatured alcohol today for a short while. I soon removed it and decided the real problem was the block.
It came with the Swiftech h20-220 Ultima Extreme kit, but it is designed for a low volume system.... certainly not with a 3 gallon per minute pump.
I did a lot of stuff today and took quite a few pictures which I'll try to get to tonight. I opened up the block, removed the inner o-ring, drilled out the inlet hole to match the size of the outlet, and cut 4 grooves in it to allow more water and it worked like a charm.
Now if the Chiller isn't full the return coolant shoots right through the evaporator which is about 3 inches from the side of the cooler on that end.
I'm pretty psyched to see what it's like in the morning when starting @ -45 Celsius.
Definitely better already and my pump no longer sounds like it may die soon.
EDIT: I just realized I have been mis-spelling Celsius for awhile now.
Be back soon with some pictures.