I'd say your running the wrong tire (new deep bar) for pulling, no matter what tire pressure. I'm not seeing pressure reduction making much of a difference. How many more bars are going to be in contact with the ground at 12psi versus 16? When running deep bars like that, you got to get additional bars in contact with the ground to increase surface area. It's not like tires that are near bald where every square inch gained is more surface traction on the track. The bars are intermiten around the tire, where as there is some constantcy with baldness. Hope I explained that to be understandable.
Anyways, there is a whole big science to tractor pulling tires. And it's a science thats better thought of in the reverse. One should think of it in tired baldness with enough bar grip to accommodate track. And not new tires with enough baldness to accommodate track. Kind of a backwards way of thinking, but better off to be on the bald side than on the new tread side when making bar depth adjustments.
I've never heard of pulling on gravel. Sounds like they are hard up for a place to have it, and using an old city side street, or county mixing strip. I think I'd either skip it, or pull in it without a care in the end placement results. They surely can't be expecting serious pullers to show up and compete on a gravel track.
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