I bought a Custom Chrome "Bike in a Box" back in 06. Back then I used it to commute to work on, mostly.

Frame has 6" up stretch, 4" back bone stretch. 43* rake with an additional 7* in the triple clamps. According to an online calculator it has 2.6" of trail...so needless to say it is a handful at speed. According to the same calculator if I were to put a set of 5* triple clamps on it the trail will be 4.6". I spoke with a shop that used to build custom choppers...he told me that should help with its bad manners at speed.
My back is shot, so riding this thing, with the constant corrections it takes and its very bad 70mph manners is simply not going to happen....I have another frame but that is for another post.
Anyway...a buddy wants my chopper. I mentioned to him about the shop suggesting a set of 5* triple trees. We are both curious to see if they help with this things somewhat evil handling. Keep in mind my buddy is a drag racer, has gone as quick as 8.1@175 in the quarter and has run over 200mph in a rolling half mile race...so for him to get spooked by this things says something...lol..
Triple trees will be delivered today. Chopper needs a battery, which I will be picking up tomorrow. Plan is to swap the triple trees on Friday. Problem is I have no idea how to deal with the steering head bearings. Triple trees are of the smooth top design, so I do not think there will be a spanner nut. Every place I look I see a drop test mentioned...well....with the forks beings as long as they are I don't see how that will be accurate.
Spent my life riding sport bikes. I simply used to torque the spanner nut according to the manual......I very well may just go by feel....but would appreciate any and all input....

 

I think your 5 degreetrees will help a little, use tapered roller bearings and check swingarm plus wheel bearings.
That will do.