I think it's great that you are trying different rotations however you should research current best known rotations and build from there. Be a little wary of the "top" parses on parsley. Those are usually from players with best in slot gear and a better than average parse. I don't see how any Marksman sniper could parse >6.9k since the 4.03 nerf without incredibly lucky crits. For reference, in mostly 220 gear from ops (not crystal), my max parse on a 1.5 million dummy is about 6300 dps (engineering spec) but I average between 5800 - 6100.
You said you parse 5.5k in KP. What fight was that? If it is on Karagga, that's not bad. I've seen well geared players struggle to get 4.7k on that fight. I usually shoot for 5.4k as a baseline. But, if that was on the Fabricator Droid it would be very low. If your group is good with the puzzle you can do over 10k dps on that one.