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@Moustachio
What axle length are you using?
The BB is designed for use with double and triple cranksets, but i have used very successfully with SS cranksets many times. As the BB axle length increases the RH axle moves out further with respect to the left to make room for the two or three chain rings being used. Older triples used 125mm where the RH would stick out much further than the left and cranks were designed with this in mind.
The Zenith looks to be a SS specific crankset so i'd recommend a 110mm or 107mm as here the LH and RH are near the same and keeps the Q Factor low for high power transfer.
If your LH crank thread is out by 4mm then this can be EASILY FIXED with a 2mm spacer on the RHS. These are easy to get hold of and are the same size as older cassette spacers.
Before installing BB into RHS slip the spacer on, and then install as usual. This will even it out.
Just be sure to use grease or anti-seize on the metal threads and a bit on square tapers before installation, so it doesn't seize in place later on...
Good Luck,
i'll have a look for some BB spacer now and send link later...