I’m not sure what to finger this as to attempt to resolve it but it almost looks like a bit of over-extrusion?
Under retraction?
Honestly, I’m not experienced enough to be able to answer you either way on that just yet. 
If it were any other printer I would say a fraction close to the bed, 0.05 higher would cure it, but I don’t have a K2. A little overextrusion about 5-10% too.
It depends on filament used. For PETG I go 0.025 higher than for PLA - and I usually set flow rate to 1.02 on first layer for any filament!
Thanks a lot frank. I actually ran with +0.1 on petg and so far it’s beautiful. I can’t find the initial/first layer FR though. Could you please enlighten me? 
It is in the ‘Quality’ slicer section relative down in the ‘walls and surfaces’ area.
0.1 would be far too much for me but I print mainly on the epoxy textured print plate from creality which is not so coarse than the standard one. I just printed 2 projects (totally about 7 rolls) with 15 different PETG from 7 different vendors and all worked out perfectly!
So in the ‘Quality’ section, would you set ‘Bottom surface flow ratio’ to 102 then?
BTW, I’ve noticed some ambiguity in Z height, possibly depending on firmware/software version and/or whether or not the filament presets were updated (green Creality button top left.) After updating the filament presets, we’re now having to use a slightly positive Z heights to improve PETG first layer (like many others here.) Before updating the preset, we had to lower the head by 0.1mm or more to get PETG to even stick to the bed.
What I tell others here to do, is create a skirt of at least 10 lines on every print. Start the print, then while it is printing the skirt, tweak the Z height from the Fluidd Z up/down buttons until it looks good. Then baby-sit the first two layers to make sure it looks good. Z +0.05 seems to work well here now, but that value could be radically different for you, and is subject to change at any moment. Also created a 300mm cube, two layers thick, just for testing first and second-layer issues (and bed leveling issues, which were never resolved.) Printed many of those, trying to iron out height issues - kinda gave up because firmware and presets keep changing, invalidating anything gained.
Yes, I believe I mentioned it also here where I describe some of my standard print settings I use usually.
Thanks a lot frank! Those settings produced some really nice petg prints so far!