Sorry to raise this topic from the dead, but did you ever find a solution to this? I find myself in a similar situation on a number of points:
1. F1 750
2. Replacement plates from DS with angled slots on the 'standard' plates rather than perpendicular
3. No 'double' plain plate (that I recall seeing)
Where it differs is the the exact symptoms - the bike is rideable. And can even be held in gear with the clutch in and no need to hold the brake. However, the gear changes (downshifts especially) are so bad that false neutrals are a frequent occurrence because I can't get full throw on the gear lever. That on its own would suggest the clutch lifter needs adjusting, but a: it already is, and b: while the clutch still drags with the lever held fully in, it doesn't actually properly bite until the lever is almost completely released.
I'm fairly sure I'm going to have to take the whole lot apart again, but curious to see what I'll be wanting to look for when I do...