Jake....gotcha...the good ole days of chrome.
I finally gave up my Pentax 645 NII medium format camera two years ago. lol.
I was just reading DP review on that model and it does have some custom settings that will delay the flash and also the sync speed for external....I would play around with the camera menu's to see if you can find these functions and see if you have something setup wrong.
One thing you didn't mention though is if you are keeping the camera on Auto or (P) mode vs switching it to manual mode. I ask because you camera could also be making adjustments to give you what it thinks "proper" exposure is if the strobes are firing properly.
Lastly....tell me a little bit about the strobes you are using as well.
Oh...just encase.....go into your menu, look for the flash settings and turn off the red eye reduction. It might be that simple too.