K1 Unloader issues

running an electric start Torini 15hp with a direct drive 23 liter per minute chinese pump and a turbo head wand setup, i recently converted this to the K1 pressure sensitive unloader but could not get it setup right at all, from research i am led to believe that when setup correctly there should be a small amount of water dribbling from the bottom bypass port while the trigger is pulled - mine however is a high pressure jet out the bypass port.

If i adjust the lock bolt on top of the unloader it either shuts off the bypass all together or a massive jet of water, i also noticed the motor really starts to labor when bypass is closed/almost closed - a lot more laboring than the regular unloader valve.

not sure if the k1 unloader is suitable for a direct high speed pump, maybe it should only be used with a gearbox driven pump ?
faulty k1 unloader ?
should i pull the unloader apart, maybe manually change the spring tension ?

thanks in advance

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