Can't get enough cross in 05 phenom

I have a x-factor RF spindle!!! The thing that alarming to me is I achieved 63% with out maxing out washers it's close but I do have more room for adjustment!! I weight 170lbs my brother is 130lbs so there is a difference in driver weight have alot of lead mounted on the seat. Also I thought you were always suppose to runn the axle straight?? I do have the adjustable cassette on the LR could i maybe go down on that a bit to achieve the cross I am looking for??? One other thing i'm trying tomorrow is taking the spindles off my phenom and putting them on his kart to see if it really is the spindles or not.

Thanks for all the help this is all good info
 
Just to give everyone an update I took the spindles off my phenom and put them on the my brothers and we gained 3% cross. So we have a tweeked spindle thanks for all the help guys!!!!!!!!
 
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