Wow, that is the cleanest clutch I've ever seen!
Not helpful for your issue I know, but what I actually meant is that the less free space you have, the more preload is put on the clutch springs and the more effort is required to pull the lever in.
My adjustment in the clutch cover is maxed out too, but with it turned all the way out, my release arm contact point occurs just after the notch in the arm lines up with the mark on the cover.
When I let the arm hang down with the cable disconnected however, it drops right down till it hits the clutch cover - you can't unscrew the oil cap without lifting it out of the way. -I wonder why yours seems different? Edit- ok I see you have the clutch cable still attached - forget what I just said!
My cable slack adjusters are screwed nearly all the way out too.
I don't remember my basket being loose at all once the four clutch spring bolts were done up (just a teeny bit of in/out play).
John