I did a lot of reading and it seemed like users experienced 'mushy' negatives with 1:1 microdol with Tri-x, and found that 1:3 was a sweet spot for reducing grain and maintaining speed. Crap, just placed an order. Either way, at least I can experiment and see what happens and report back for other users.
I like that aspect of Pan F+ and I have shot a handful of rolls and developed in Pyrocat with excellent results. I mean, some of the best prints I've made.