2006 series 2x2 sport 36volt ezgo ?

[Homelitexl12]

Ok new here and thanks in advance for any help.i have a 2006 ezgo I just bought all brand new batteries and a 500 amp curtis controller with a what was advertised as heavy duty solenoid it's a curtis sw180 1124.cart has lift and 22" tires.i am upgrading cables to 2 gauge this week.my question is should I have a higher amp solenoid to get the most out of controller?also cart only does 9mph as of now and I am fine with that. if I got a new high torque motor would I see any increase in performance and is it worth it? Stock motor is 2.5 hp.i have also installed a heavy duty f/r switch on cart.
I know there are multiple questions and my description is all over the place lol.sorry for that