I'm running GM syncromesh with the friction modifier and 2nd and 3rd are still very hard to get in and out of. (running the carbon fiber blockers) I was recently told I still should add friction modifier.
I'm not sure which blockers you are running at the moment but friction modifiers won't help brass blockers. (I know you have/had brass in your 5-speed and own a set of OEM fiber blockers)
I drove a recently rebuilt 5-speed with brass synchros built by Dave that had just ATF in it and it shifted better than mine. Dave told me to add more friction modifier.
i put in a 5 spd from a 95. micah built it so it's probably junk. but i think has the normal brass blockers. got some exhaust work to finish fabing before she is back on the road.