Well... Thanks everyone for the replies. And yes, Calli is acrylic based and the pad I used for writing is a Clairefontaine, so I suppose this is not an issue. My problem was (and still is) WHY the ink behaves like that. I only have one bottle of it and I need(ed) to know what should I do: make it thinner or make it thicker? It sounds like I'm being stupid, but until now I didn't really bother about inks. The cartridge in my fountain pen was just fine. Now it's a whole lot different...
And as for the Nikko G - I think of ordering (a) new one(s) since everyone says is smooth and everything - mine just happens to feel scratchy. Plus I have to press quite a lot for the shading (which obviously doesn't happen with the LP EF).
But back to the ink issue: I did read quite a lot and I know about McCaffrey and sumi and walnut ink and that they have good reviews. BUT I live in Eastern Europe (Romania to be exact) and getting those ink is like digging for water in a desert. Sort of... Seems like the 'almost' half of a century of communism threw us another century back... But I really consider making my own walnut ink - that's on my to do list for this autumn...
PS Schin, I wasn't criticizing your ...hand. God forbid! I too consider it as a touch of style (as Andy stated). And whenever I feel depressed because of my wobbly letters I watch some of your videos to get inspired...
...and then get depressed again seeing your work and others and thinking I never gonna get there and that...
, well, don't mind me..