We bought a used 86 C-27 2.5 years ago when we moved back to NC. it is our second C-27, we had a new '86 back in 1986 that we sailed for four years with our family of 5, three daughters, one adult and me, sort of in-between.
I have had some experience on C-16's and 23's as well as some planing hulls. In my opinion the ComPac's do not sail well with much heel and will round up with a gust. That is not a particularly bad characteristic. If you are fighting a bunch of weather helm, it is probably time to consider reefing. Our current boat has one reef point in the main, a 150 or 155 jib, a stock 120, and a 120 that is cut down to about a 90. I should measure these to be more accurate.
The 155 with full main is good till there are a few whitecaps on the chop. Next is the full main with the 120 which is good till there are a bunch of whitecaps and the chop is getting organized into some waves. Then a reefed main and the 120 will take some of the weather helm out and I would be wishing that I had put up the 90 instead of the 120 if the wind is still increasing. The reefed main and the 90 handle steady winds pretty well. However a couple of weekends ago the wind was gusting above 25 mph and the boat was getting more challenging than I wanted to handle by myself, and I wound up with just a reefed main. The boat was easier to handle and hit 5.5 kts (on both GPS and mechanical knot/log meter). I wish that I had the boomkicker that the comptroller has put on hold, installed.
There are really no great places to sheet the 90 to. I have been using the standard jib turning block all the way forward on the track and it doesn't seem quite right. I just had the 90 re-cut shortening the luff. I wanted to be able to hoist it higher getting the foot further off the deck. It has been an interesting sail. A couple of weeks ago, I was tho lazy to change the jib as the wind dropped and I was just a couple of miles from home. It was a head wind probably 7-10mph. There was an O'Day 34 with a large overlapping genoa that was headed the same way. From about .25 nm behind I managed to pass him and gain a couple hundred yards windage on him in about 4nm.
I was surprised. The '27 was sailing upright and I am thinking that the 90, trimmed very tight, really increased the efficiency of the main. I know that the O'Day was trying....other factors could be bottom, mine is pretty clean and weight...I had dumped the water tank.
Anyhow, I recommend the C-27.....
ps As Wes and I have found it heaves too nicely