Before you go out and find a different MC, try bleeding and re-bleeding the whole brake system (all 5 bleeders and possibly the MC) in the factory recommended order. It took me a few tries to get all the air out after my 44 swap.
FWIW, my brakes (after they were fully bled), are better (firmer) now than they ever were w/ the IFS (keep in mind this is compared to my '86 "4cyl" calipers and 13/16" MC). I put in a 1" bore MC from a '92-ish V6 truck... I'd assume your taco already has a 1" bore.
Complaints of soft brakes after a 44 swap seem to be fairly common. <IMG SRC="smilies/frown.gif" border="0">
I can't "easily" lock up the tires, but it can be done...