What RPM going through the traps with a 408?

I,m having a hard time in my search for 10,s with my 408(410).My best runs have been 11.20@118 with MT DR 26 inch and a 3.91 gear.(going through the traps @6600-6800rpm)I now have 4.30 with spool and lastnight ran some older 28 inch Hoosier slicks,going through the traps @6800-7000.I have a 7000 chip with MSD 6AL.My Coan 8 inch 4500 stall is working good(lastnights 60fts were 1.56)Will new slicks help my 60fts?What RPM will these strokers top out at RPM wise?I,m making all my HP around 5700rpm so would it be worth it to get a 7500 chip and go back to the 26 inch tires(will I runout of steam?)All I want is a 10.9!LOL.Lastnight some people telling me my car left hard off the line,then my buddys wife and another friend said my car spun off the line?I,m debating some new 325/50/15 MT DR(I do take the car to a couple car shows per year)Any help/advise will be appreaciated.Thanks

P.S Should I try a 1 inch carb spacer also?