Anything over 188 with a blowdown of 31-32 will work well. For a roadbike 188-190 will get you around 30-32 even with a 30-33mm carb and with a very nice and early powerband.
Looking at the dynograph I'd guess this engine has 28-29 blowdown and could do with a lot more. Most modern pipes appear to like some blowdown. If I were him I'd try to lower the barrel to get the transfers down 2-3°, and then raise the exhaust port again to what it is now. I'd say there's a good chance it would get on the pipe just the same as now, but instead of tailing off the power would then keep rising. Right now I'd say the engine initially kicks you in the butt and then feels rather tired.
Oil is not that important for the Liedolsheim. I don't think the slight dip is clutch slip really. On the road it should feel as if the engine was taking a deep breath before changing the exhaust note and doing the kick in the butt part. You could try a slightly larger idle jet, or a degree more advance of the ignition. Chances are it's characteristic of the pipe though.