At this point in time, you need seat time. Strive for consistency and make small adjustments to see where they take you. Use your builder’s setup as a base and work from there.

How tall and heavy are you? What is the measurement from axle to back of seat lip? How high is the seat from the bottom frame rails? How many spacer do you have on the front spindles? What air pressures are you running and How old are the tires? What year make and model is your kart?

I’m not joking, please answer all these questions and we’ll take it from there buddy.

It actually sounds like the opposite. With no seat struts, caster in the front, and a narrow rear, it sounds like your kart is setup to flex and lift the inside rear quite a bit.

Are the other karts you’re referencing all Tony Kart 401s? Because different manufacturers will have vastly different setups to achieve the same end goal.

The tendency for new drivers is to grossly overdrive the kart, resulting in similar complaints about lack of grip. Have you tried to adjust your driving at all to counter the handling woes you’re feeling, in other words, slowing down your entry speed and attempting to get back on the throttle earlier, driving through the corner.