Very much looking forward to seeing your newest version.
What I mean though, for bigger beam balls, is that the white core of the glow looks too skimpy. You see a medium-sized ball of energy spool up (with a hefty corona of flare or whatnot), then see a beam pretty much the same width as the ball emerge out of it upon firing. That's what I meant when I said it looks imbalanced. I almost expect the ball to shrink and disappear as it's drained into the shaft. In fact, the current glow almost looks like it's the rounded off end of a beam shaft, rather than the ball of energy that's the source of the beam.
I don't quite get that impression with the current MVP terran beams, though to a certain extent, MVP LReds fired from Ravanas kind of give me this impression as well. It's less about the size of the sprite than the size of the white part.
Also, when you're modifying explosions for slash beams, it'd be nice to check if they were still big enough to form a nice continuous line of burn. I understand that the beam skips along the hull, so if explosions are too small, they might look disjointed.
(+1 vote for upsizing the terslash just a smidge. It should look almost as big as a BGreen, IMO. Also, the screenshot might be outdated, but first page of this thread shows the lterslash as comparable in size to an AAA. That's a big no-no if it's still the case.)