anyone experimenting with linear advance?  

anyone experimenting with linear advance?

I noticed that the unreleased firmware has linear advance enabled. Yesterday I compiled a version and updated my MK2. The first results after tuning are great: I set Slic3r to 120mm/s and printed a 0.2mm with 0.07mm roof and letters benchy in about 45 minutes. The benchy was rather good with some minor issue, photos at https://imgur.com/a/yYGRV .

So far so good, this seems to enable really fast print speeds with high quality results. So today I printed one of my own designs, a mostly hollow 3 perimeter mostly cylindrical object, at 0.25mm layer height, set the speed at 115mm/s, increased all acceleration to the default for infill and printed a model of my own, about 56 grams of filament. Completed in 1 hour 44 minutes, so an average flow rate during entire print of about 5.5-6 mm^3/s - not bad at all. The result looks very good: no ringing and very even surfaces - although at this speed it's matte instead of glossy.

The only remaining problem is the z-seam: it looks relatively good, but it seems to have stopped extruding just a tiny bit too soon and/or started too late on both outer perimeters. The one inner perimeter is mostly ok. Problem is, I'd like this part to be relatively airtight without coating it later and it's a bit leaky now.

I'm going to try more settings tomorrow. My question here: is anyone else here experimenting with linear advance? Have you experienced anything like this? Is it just a matter of reducing acceleration or speed, or just better tuning of the K-value?