You are starting to understand some of the issues with fishing from a paddle boat. You need to simultaneously use your hands to fish and paddle. Here are a couple of helpers. Usually tracking means the ability of the kayak to go straight while paddling. This is a skill that you will develop with experience. Some boats track better than others but all of them will with a little work. If by tracking you mean that the boat does not drift straight after you stop paddling – I have never met a boat that does. While a sea anchor might help I doubt it and would suggest that you either anchor or try a small one hand paddle to help address your drift. The same is true of your second comment which I read to say that the boat drifts toward shore in the wind and chop. Again, I have never met a boat that does not. If you watch the guys with the big bass boats they are constantly running their trolling motors to hold them in place. So while your boat may be a little more susceptible to drift than a larger kayak, I doubt that it is by much and I will guarantee it is less than my canoe which offers a taller profile to the wind. Usually the advantages of a kayak out weight these limitations.
2-3 Canoe/Kayak Trailer