You've got a lot of questions up in that post there,

while it may not answer them all, I'd search for "Hobie 16 Tuning Guide" on google and see what you get, I pulled down this URL,
http://www.cat44.com/hobie-16-tuning-tips.htm
that seemed to address at least some of the issues you had. When I'm not on company time I can go through and give you some overall advice. I'm sure others will chime in before that though.