Ahh, ok. Sorry I misinterpreted the context of your OP and thought you meant "new direction" in general, not in the sense of improving on your already established beers. pjj2ba had some interesting ideas a while back that aren't what people 'normally' think of. I'll see if I can dig up those posts. Tbh, as far as process really all that comes to mind is what people get into, which you mention you have been doing.
Decoction, but that doesn't fit every style or malt really. To make the most of it, you should only be using rests that match the degree of modification of your malt. As you know, most malts today are more fully modified.
Water, you can see what different waters do to your brew. Try to find a spring and make a beer with it.
Sparge, I have been a fly sparger since the get-go so I am not entirely sure how different it will make it. I will tell you that the single most important thing is the rate. I never worry about mash-out and have always been very happy with the results.
What exactly is it that you are looking for? More "grainy" flavor? Malt? Clean? There is really only so much you can get from a malted grain. It has limited potential in itself.