Thanks for the reply's. I wanted to follow up here.
My problem was simple and very foolish on my part; the topping lift. I had received the boat in the water from the previous owner last fall and had never needed to adjust topping lift. Then in the spring I replaced the line and just set it in place. By the time the boat was in the water I had forgotten that it probably needed to be adjusted and I think by chance it was very close to the right point. In my previous few sails this season I had sailed with the genny up and just didn't notice that the main was a bit out of trim. This all hit me at random a week ago and sure enough it needed to be dropped a few inches (so that it has a bit of slack with the main up). This mistake certainly reflects that I still need some more experience and probably more formal training at some point.
But thanks for the reply's. I do understand well the impact of sailing with main only (more weather helm) but on my boat it's not bad. However in the future I'll try to sail with the proper sails.
1979 Contessa 26