As already stated, be sure pressure is up to spec now. If it is already to spec, I would limit raising no more than 10% so that would be a max of 2750. Just remember that the stability of the tractor will be changed by the extra lift capacity. You will need to add extra rear ballast to counteract it. I would try adjusting pressure in 50 psi increments to see the minimum you can get by with. Extra pressure will put extra strain on pump, oil lines, tractor drive train, etc.
How much ballast do you have now? Be sure you have at least the minimum required in the operators manual. If you have no fluid in tires or wheel weights, you need a minimum of 816lbs on the hitch. With fluid and weights, you still need minimum of 375 lbs on hitch. These numbers reflect loader lift capacity with pressure at spec. Figure 10% more for ballast it pressure is adjusted higher. The picture shows the adjusting screw.