It’s my recollection that the head angle is steeper on an 888 compared with a monster, with the option of going steeper again for track use.
There are some interesting comments in Shazzam’s Post here:
https://www.ducati.ms/forums/80-hall...wheelbase.html
There’s also a useful thumbnail sketch attached which shows the geometry.
If you move the forks forwards relative to the steering stem you will reduce trail: something you’ve already done by raising the tail and steepening the fork angle.
I would be tempted to draw out the standard geometry at normal ride height and both extremes of suspension movement, then do the same for your modified geometry to see what changes you get, before trying it out for real.