JS Motorsport breather

Great day out today, 250 miles of twisting back roads and came home just short of clicking over 6000 miles.
Oil in airbox - 100mls or so drained after the run, a bit down from what it has been but obviously not the magic bullet.
General performance - it does seem to run more smoothly at low revs (but maybe i just it want it to feel like that), and the idle has dropped from 1600 to, usually, 1300 although a couple of times it stayed higher.
Gripe - steel chainguard broke at the front mount. Nothing unusual i believe but i don't much like the look of the CF one so surgery to be arranged.

Edit - i am still running the original shorter dipstick, oil level just on the stick at the start of the ride.

BritTwit said:

Someone on the classic forum with a 750/850 reed valve suggested drilling a tiny hole in the reed to allow a small drain back into the crankcase, but not big enough to allow a great deal of air to invade.
Dunno if this would do more harm than good.

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I did that. It’s not going to do any harm but I’m not convinced it’s going to make a difference either.

I cha ged from shorter to longer dip stick. No significant difference. I was center of marks on the short sit k and 2\3 up the knurled section of the longer stick.

Have been reading up on crankcase breathing on air cooled Ducati's (as something akin to the Norton) and it seems that their breather spits out oil when the engine suffers "excessive blowby". I also see TonyA's comment in the Lean?? thread about his oil issue reducing with a well bedded in set of correctly fitting rings. And finally i recently read one of Richard-7's past comments suggesting the same. So no more mucking about with this until the engine has had a birthday, which will be a month or few.