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If what you say is true and you dont go over relief then you could also use a slightly smaller motor to increase winch speed as well. You currently have just over 900nm available with you current setup at the moment. If you dont need this much then you could do as above.
You could sacrifice some torque in favour of speed then if required just double the line pull.
Bit of an update, new PTO hyd pump set up runs at 525rpm and 575rpm depending on PTO position selected. I am running a 70cc pump to drive either a front or rear winch. The front is a 15000lb milemarker and the rear a 20000lb winchmax. The line speed is more than adequate, faster on the front but suspect this is due to the different gearbox ratios. I am waiting on the pressure gauge setup to set the system limits. First observations are very encouraging to say the least. I looked at the speed increasing gearbox route but became too much of a beast to set up.winchmax.jpg