I know these offsets are pretty close, but which would be the most recommended offset to get for the CS?

Obviously I'd rather go w/ the more aggressive offset but I don't want to have any issues with rubbing during hard cornering or hitting bumps. These will be used as track wheels.

Can I go more aggressive to +30mm or is that pushing it?

 

without a test fit including the tire (as that will obviously be important as well), i'd go with the least agressive offset and then use some 5mm or 10mm spacers to see how far out you can push them.