i also do what chingon says and put pressure in a diagnol direction... it helps mucho. Also shifting into 2nd before first can help. first gear ratio is 3.2 (yikes!) its pretty much useless top speed 30 or so at redline... even on most auto x courses... 2nd is a pleasant 1.9 which is way more useful... 70-80 mph at redline i think?

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1st does have a syncro... actually 1st + 2nd share a syncro, as do 3rd & 4th. 5th has its own syncro. reverse has no syncro... roll backwards at 5mph and push it into reverse LOL gotta love that crunch
gear oil really isnt the issue here....nor are the syncros... going back to the original post, a possible culprit is your slave cylinder, if its not letting you release the clutch disc all the way it will grind, pop, or just be generally rougher than normal. It will also cause the clutch disc to wear alittle more than normal.
Check the slave cylinder boot and see if its wet with brake fluid... if so the seal is going out and the unit needs to be replaced. If the boot is perfectly dry you might just need to bleed the system.
good luck!