As a MCH myself, I find that crit and determination are far more useful than skill speed. Yes, you can get slightly faster attacks from skill speed, and yes it does boost your Lead Shot damage slightly, (which is your highest potency attack aside from Wildfire, once it runs it's full course). However, as your argument is in part in favor of the buff to Lead Shot, you have to remember that each individual tick from DoTs has a chance to crit. This means that by boosting your crit rate, you have a higher chance that any or all of the DoT ticks from Lead Shot will score a critical hit, any one of which would make up for the minute amount of damage that you would gain as a whole from skill speed, while determination on the other hand is a boost to all your skills and not just Lead Shot. Don't get me wrong, there are benefits to boosting your skill speed, but I certainly wouldn't boost it over crit and determination.....