Forget launching at 3,500rpm.
If I launch @ 2,000rpm my car just wheelspins and then drives off, If I launch at 2,500rpm with a full car load - (200+ kg's extra over the back wheels) it sits and spins even more.
I find giving it about 1,500-1,700rpm works best for me (but then again my tyres are sh1t).
Go grab yourself a fuel regulator and an exhaust cam gear and give it some more tuning and you'll crack the 13's.