[Jack E/NJ]

>>>I'm afraid of putting too much force to the crankshaft nut. I also am afraid of using the starter to turn it in case the ring gear or starter might get chewed up.>>>

Sorry, but from your description of what you've done over the past 5 years, you may be a bit too afraid. If it were mine, I'd squirt a liberal amount of MMO into each cylinder. Let it set a day or so. Then use a breaker bar with an extension on it for control to gently nudge the crankshaft nut a little bit at a time till it turns easily.

Jack E/NJ