No, don't.
Get your kart scaled out and let's see what we've got to work with. Tell us some more about the chassis set-up currently, caster, camber, etc.
It may be that you simply don't have enough caster, or that the seat is mounted too far back... who knows at this point.
"Tight in" tells me that you don't have enough rear stagger - that's the first thing I'd address (AFTER you have some valid scale and set-up info.)
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Thanks and God bless,
Brian Carlson
Carlson Racing Engines
Vector Cut
z
www.CarlsonMotorsports.com
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32 years of service to the karting industry ~ 1Cor 9:24
Linden, IN
765-339-4407
bcarlson@CarlsonMotorsports.com