revisiting After side shift tranny rebuild - still shift into 1st issues, About 50% goes shift right in, 50% no can do Options

[jjs3rd914]

Side shift tranny rebuilt

All gears shift beautiful but 1st, linkage adjusted properly, bushings all new
No issues with clutch tube in tunnel
New PP, TO bearing, 6 spring clutch disk
Stock flywheel cut .025" and TO bearing fork pivot ball washer added by .025" to the stock .060"
All motor mounts good
Clutch adjusted properly

Used very good 1st reverse slider
Used almost new 2nd-5th dog teeth with appropriate brake bands etc.
Used NEW synchro ring

About half the time it goes right into 1st very smoothly. No grinding, no issues with reverse, linkage feels great. Other times will not budge into 1st gear. By going into 3rd gear first then trying seems to work most of the time as workaround.

SO after reading numerous threads we have concluded that could the issue be

1. Are new synchros much stiffer than used one. SO DO THEY NEED TO BE WORN IN?
Could that be part of the problem and could problem diminish with use?

2. And Using a 2-5 dog tooth gear and brake bands also be part of the problem?

I do have original 1st gear brake band and am willing to buy the correct 1st gear dog gear.
Also I have many good usable "worn in" synchro rings to use instead of the new one.

So if problem does not go away, could I be faced to replace the above to get it right?

I have no issue doing so. Just want it right.

So anyone else faced with simliar issue and how did you solve it. Some Prior threads seem to point into maybe not using a new synchro and not using the 2-5 dog gear.

Thanks
jjs3rd914