This may be a bit of a long-shot, but I have had some Sierra games have trouble with too many cycles.
Either Gabriel Knight 1 or Space Quest 6 (I can't remember which), one ran fine at 10000 cycles, the other if I ran it at more than 5000 I would get a bit of choppiness for the sound. Didn't have any speed problems with it, but then I never took it higher than 10000 either.

Perhaps it might be worthwhile to try running the game at lower cycles and see if it helps?
(On the other hand this was several years ago, so Dosbox has improved since then. Probably wouldn't hurt to try...)

I'm a bit confused but pretty much satisfied with the performance I've gotten. By the way dougdahl thanks for responding, but yeah it just slowed down. It turns out at 30,000 cycles the in-game animations are fine and the sound isn't choppy as it gets at higher cycles than that. I had been testing how the animation was by the load game screen fade in which still isn't as fast as it should be (I could get it that fast with vdmsound). Also some of the in game "cutscenes" (such as when you look into the water at that statue) were a little choppy. But I'm basically happy now. Geez sorry guys, I have a habit of making threads and then resolving the problem myself via founding out that I'm dumb and made a mistake or overlooked something.