Can anyone help me hack the joystick for my electric wheelchair for more power?

I've looked everywhere for help on this but can't find an answer. I purchased a Meritt's Regal 310 electric wheelchair that uses a Dynamic DL 5.2i joystick. I've added a quick clip showing the inside of my electric wheelchair controller "DL 5.2i" by Dynamic. If anyone knows how to manually tweak it to provide more power to the motors, please let me know. I've already had a guy from a resale shop try to adjust it with the corresponding handheld device with no luck. I transformed the chair into a portable transport, with room to haul stuff as well as attach a trailing cart for additional items. It works great but has a hard time going up hillls. Thanks, T

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