If you find that the flavours of the sauces aren't permeating the chicken, the answer is marinating. Also as full_metal says, dicing the breast will get a much more even heating - without dehydrating the outside and simultaneously undercooking the centre. I dust it in Maizena lightly to get a pleasant crunchiness.
However, I suspect that the real problem is you're somewhat cooking on autopilot. You're going in without a clear idea of what you want to make, and sort of vaguely throwing a handful of spices, and adding a bottle of sauce on top, and finding that it's unsatisfying. If you want to improve your cooking, plan ahead. Come up with ideas while you're at work. Stumble around online to find recipes that you can handle. This
stuffed chicken breast breaks down into a very manageable dish, and looks amazing. I haven't cooked out of a bottle in a long time now, and there's a huge difference in the richness of flavour from the equivalent dish made from scratch.