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It will if you're level 110 on main and level a sub to 75. Your main then will go down to 105. Switch craft back to main and re-level to 110 or keep at 105 and switch to some other sub and level to...

see my first response. I had zero issues uncapping a subcraft to level to 75 while making a shield and did not lose any shield progress while doing so. After I was done with it at 75 then I just went...

How do you recap a craft from 75 to 70? If you mean will it go back to 70 then it happened with no issue.

I had no problems changing crafts to level a subcraft to 75 with a stage 3 shield and didn't lose any progress doing so.