Old 430EX won't sync with 5Diii when used off camera, if shutter speed is over 200.

I am using a cowboy studio transmitter & receiver.  Manuals for the 430 & 5d both indicate highspeed sync will work with higher shutter speed.  430 is set to highspeed sync.

The Cowboy Studios won't allow HSS.  I'm not sure what model you're using, but knowing Cowboy Studios I'm guessing it's full manual only. The Yongnuo 622 triggers will allow HSS.
Again, I don't know the specifics of your trigger.  But Yongnuo manual triggers (602, 603) will still trigger if you go above max sync speed, you'll just get banding due to the falling shutter.
Keep in mind that HSS significantly reduces the amount of power out of a flash.  And since it's effectively a continuous light at that point, the faster the shutter speed the less the flash can contribute to the exposure.  I'm not sure what speeds you're using, but if you're up in the 1/1000+ range the power output will be quite small.

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