The mediavps DO have better in-subspace effects! Check mv_effects.vp's Maps directory for noise01.dds and noise01b.dds ( if I remember the names right ). There are 2 versions: 3.6.10 betas and older ( effects like in Transcend ), and current 3.6.10 ones. How could you miss THAT?
There are also Vasudan Turret effect bitmaps also in the mediavps. Don't tell me you missed that as well!
Also, almost all laser weapons in FSPort have different laser head and tail radius', so the effects in-game are "rotated" and look damn ugly with the FSPort mediavps. The trick with different laser head and tail radius' works only on retail effects, while it ruins the newer, better effects, like the new fsport mediavp ones.
I've fixed all of these myself for myself. Though if you're interested in getting that TBM and extracted effects, just PM me. Just note that the different radius' might make the effects of different sizes than the originals, as I haven't checked the original values. Though they looked just fine in the tech lab with my fixes.
As for the shielded Valkyrie, I believe that it might be a corrupt pilot. Check that mission with another pilot and see if it's better. I experienced this a couple of times as well.
P.S. The HTL GTF Angel looks sweet