Bingo...
H-man wins.
Yeah, suspension can play a role. Honestly, I doubt that anyone can tell you if your preload, spring rate, or dampening is correct via the internet.
I can usually ball park it in person...
But, honestly, most racers that don't have good dirt track experience focus too much on their corners with long radii that have high corner speed. You can't put down any power 'cause, even with the SV, you've used up the traction. You try to put small amounts of throttle down, and it doesn't hook up...you run out of space at the edge of the track.
Yeah, could be suspension, but execution is still a big player...
Here's a question...
Why would you think you need more preload?
Do you know what adding preload would accomplish?