Have you considered getting a cheap inexpensive microwave dedicated to darkroom work? I found one recently used for $25 and it works great. You can put your Pot. Ox in a big pyrex and just zap it in the microwave so the fumes would be at least limited somewhat and plus its alot faster than putting the developer on a hotplate to warm it.
to be honest I have never seen a pinkish hue from a pt/pd on cranes, and Ive done a fair amount of them. you are using distilled water in your developer right?
makes me wonder if something in your water could be adding to the pinkish stain. not sure.