If I'm enrolled in a CSU during the fall, and a CC during the spring, what will a UC see?

I would re-evaluate that 33 unit figure. Unless you are trying to transfer to engineering or have a lot of “remedial” level courses I doubt that your unit count will drop that significantly.

Additionally the unit ceilings can be seen here:

http://admission.universityofcalifornia.edu/counselors/files/uc-transfer-maximum-limitation-policy-chart.pdf