I really appreciate all of your replies, it's given me a lot to think about.
My friend had a very nice D6 and a stash of PH211 bulbs. He often printed dense negatives and his times were often around 1 full minute if not longer.
I remember thinking that my times were definitely under a minute almost always.
I thought of installing a fan (or hacking one in) but decided that if i've gone this long without one then it's probably not worth it though.
If I were using the PH213 though i'd definitely work something out.
I like the dimmer suggestion and I may just go that route. I can live with a loss of 1/2 stop (or even 1 stop).
I was just thinking right before I read jfish's post that heat absorbing glass might be nice with a PH213. You could probably cut the glass to fit the filter holder, at least on my old-style head.