1st gear rebuild again! Who's using 2nd gear synchro in 1st?

[Sirius Driver]

I'm going to rebuild 1st again, 3rd time this time. It just doesnt wanna cooperate, it grinds on N-1 and on slow rolls under 5mph. Everything has been replaced. Hub, Dogteeth, synchro, but it's still acting like it always has. I've heard that a 2nd gear synchro could help. Is this true or am I stuck with a perpetual bad 1st gear? Please help me.