Weight forward is good, and we are learning to put that weight a little higher, closer to the steering stem (must be the opposite at the rear of the bike). I am moving my forward ballast higher, to try to reduce a very small "weave". There is some good info out there that indicates 'too low' center of gravity forward reduces the inverted-pendulum effect that dampens weave at higher speeds.
The riders weight is not a good cantilever for this effect, because we are not very solid through our shoulders. Back when I was racing sailboards, I learned the hard way that using your arms and shoulders to power the rig was much slower than "hooking in" to a harness that put the load through your lower back or hips. Once I learned to "hook in" I quit losing so many races. That effect is why my fixed ballast and components weights will be moved higher in the forward area of my bike.
Food for thought...I run very similar front forks but a different approach. I use external stops on the lower legs. They are set where there is contact (stopped) at rest, with me on the bike. By the time my speed is above 100 or so, there is a little travel available (due to aero drag lifting the nose of the bike) and my forks are soft enough to absorb the ruts, holes, and the "river crossing" without kicking the front end.
I have tried running a front end with reduced length from shortening the extension (with the spring more preloaded). I didnt like the feel of it....a lot of chatter in the front end.
With my current setup, when I roll off throttle at 150-160 the front end doesnt settle back onto the stops until about my turnout point. It is very easy to feel when the bike settles back down. The aero lift at top speed does not go away when you close the throttle....only when you get slower ( even when the throttle is off.)
I suspect you will have no engine braking. I prevent engine braking by staying in top gear until very low rpm, before shifting down for a turnout. It feels more stable to let aero drag do all of the high speed deceleration, and save the engine braking for later. My son and I have both found this a comfortable way to run the bike.
We all love following your project and really appreciate the time you put into sharing it with us.
Thank you,
JimL