Oh, the animation parts after the loop stop key are actually used for one frame when transitioning between animations. I moved the key out and it improbably fixed the jitter. http://www.tesnexus.com/downloads/file.php?id=31635. I think it looks the same as the original now. A way to compare creature speed is by placing a golden saint at a distance and watching how fast it runs towards you.
Ok. Tested again as before, but also checked against the other 1-handed weapons:
* Jitter / stuttering is gone for the most part, but still getting some with stationary chop attack; appears more often with swords and daggers than with maces, clubs, and axes (maybe a weapon speed issue?).
* RunForward mode - tapping the move left key causes player to move forward as well as left; tapping the move right key also causes the player to also move forward, but not as exaggerated as when moving left; only the same move left behavior seems to occur in WalkForward mode (move right only appears to move the playr to the right and not forward).
* RunForward mode - 1h thrust attack ends with weapon rising up, then abruptly drops down again and out to the right; looks like there's a missing frame or two between the thrust animation and run forward animation; actually, this occurs with all three attack types when running forward probably because Dirnae has one-handed weapons held out to the side when running.
* Spawned a Golden Saint near me to check its speed - I was able to outrun it with 85 speed and negligible encumbrance; speed looked normal, no excessive movement.