Lots of questions.....
I'm no expert on 360's but i'll try to help, but need some info.
Are you strictly flatwater riding? If so, I would think a setup wake would help.
Also, have you modded your steering to get more throw? That would help dramaticly.
You mention "wave" so I assume you're trying to throw off something larger than a setup wake. There was a thread (I think in the footrocket section) where a guy was throwing massive 360s in the surf. From what I remember, you carve, similar to how you would for a barrel roll, but you leave the wave already turning. Your weight should be forward to keep the ski 'flat' during the spin.
Killing me I can't find that thread/ video.
As far as tightening your pole, be careful if you have a stock pole and pole bolt. The base of the pole will crack. The Xmetal pinch bolts work well to tighten up the pole.