Now that you outlined the problem, I could clearly see it... probably a de-interlacing problem; just to be sure, make a fast test with NO added filters or tweaking, just de-interlacing; if the problem will persist, it's not due to the sharpening filter.
About grain: just make, let's say, grain 20% stronger and see what it does like; at the end, this is YOUR project and, even if advice is ever appreciated, YOU should decide which one to follow... (-^,)