Well, you gotta understand, I'm judging DPS as DPS (from simulation) and saying the weights aren't helpful in evaluating such extreme sets because the actual weights fluctuate too wildly. They fluctuate too wildly because the amounts you can stack can be so very different, and due to the untamed horses that are exponential crit and self-defeating ss, if the two sets you're comparing aren't in the same ballpark crit/ss-wise, the weights just don't even hold for comparing the two. Weights are only valid relative to and close to a given gearset.
Puro gave up on BLM weights for a reason; yeah, you can generate the weights no problem, but BLM was (and remains) very speed-sensitive given you have an accurate assessment of the actual number you're interested in (DPS) and can stack amounts that mean anything. Right now, we DRGs can definitely do that.
Anyway, so I double-checked my work with Dervy since he had some insane values for crit, and it turns out I screwed up auto-attack crit estimation, and that such high weights currently reflect the insanity of reality! Now my simulations yield values around .14_ for Determination and .17_ for Critical on most gear sets, and I get .10_ to .12_ for Skill Speed--the higher weights for SS basically come from sets with low values of skill speed (closing up the 24s HT/Phlebotomize gap with impunity), and the lower weights basically come from reasonable or ridiculously high values (aggravating the clipping of CT but still a net DPS gain).
Although my simulation has been very close to actual measurements the few times I've tested it against my own gear, I don't want to say it's even remotely conclusive until I have a clearer picture of how SS affects DoT potency (and ideally, the exact formula for skill speed, and I do mean exact, 3 sig figs is not enough, raaagh!).
As for what values of skill speed are too high or too low... I think the 480s are too low. So yeah, doesn't matter a bunch, if you ask me. After all, A4S Just Kills You™.