wet kit for lowboy????

Have my truck set up with a wet kit for my end dump trailer. The way i understand it is a end dump requires more flow(20-25gpm) but lower pressure(2100psi). Hooked truck up to lowboy trailer and it wont lift a heavy load. Called kaufman and they said i need 3000psi and lower flow,like 10gpm tops. What is going to be a good solution to this? Called local truck shop that set up my truck in the first place and they estimated 4000$ to get it set up. That seemed rather high to me. One guy suggested checking out the pump to see if it had a set screw that would adjust the pressure. That would get me a higher pressure but would have to remember to back it off for my end dump so i dont blow out the cylinder. Raining now or i would see if my pump had the adjusting screw. Any other ideas other than just buying a pony motor set up? thanks