Ok, that wasn't TOO tough to see from the picture. I have to confess my lack of familiarity with GFCI breakers, though.
I see your problem. the Neutral on the Spa GFCI is mis wired. The Neutral coming from your main breaker should screw into the GFCI breaker. Normally the terminal is located between the L1 and L2 terminals. Then the pig tail goes to the Neutral bus bar which is tied to the rig. Current from L1 or L2 is going straight back to the main panel neutral and the GFCI cant account for the current, this is why its tripping.
Sorry, I misspoke. The pigtail should go to the Neutral coming from the breaker, the Neutral going to the brew rig is wired to the neutral terminal of the breaker.
I'm really glad it all worked out. Hope I was able to help out.
I'll take some pics tomorrow after I clean up up a bit, it's embarrassing how quickly things get messy when I'm working on a project sometimes!!
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