With a stock motor, your ET is not be dramatically affected by shift point. The difference between 10.5 and 11.2 RPM is inconsequential, but hitting the limmiter will cost you 1/2 a second, so aim lower.
As others have said, with a stock clutch, there is no benefit to launching over 3k. The sooner you clutch is out and your throttle is pinned, the better your times will be and the better your clutch will behave. When you get back to the pits after a pass, put your hand on the clutch cover. If its too hot to comfortably hold your palm to for a couple of seconds, you are using too much clutch.
Finally with a stock wheelbase, you have more weight on the back tire, so you might be able to get away with more tire pressure depending on track condition and tire make. With a low RPM launch and a well prepped track, you could get away with 25 to 28 psi.