Nighteyes, the texture corruption issue isn't due to laser hits, shield hits, or anything 'stupid' like you suggest. For example, your effects all work beautifully in retail, as well as in Blue Planet: Age of Aquarius.
The problem is that once you start introducing large numbers of new ships and new weapons, particularly texture-inefficient ships like Steve-O's Hyperion or Federal Fighter pack, things get really dicey.
Don't take it personally
by 'stupid' I meant not important as these for overall graphics quality...
When you think about it, these new texture-inefficient ships, they use animated glow maps, just like lasers and shield hits, the overall frame count of all of them is calculated, with laser hits and shield hit, explosions and such, and when it reaches its max it starts with the texture corruption...
some glowmaps, laser hits and shield hit take as much as 100 frames, just reducing a few of them is enough to make sure there wont be texture corruption...
* on a side note, anyone who finds the flak effect too slow, open its *.eff file with notepad, and make the FPS higher, I just prefer seeing the smoke for a longer time, while not making the actual effect 500 frames to do so...