I was a senior FO --> Junior CA and the pay has not even been in the same ballpark. It was a large gain that could not have been attained as an FO. I chose not to bypass because I have come across a few guys who bypassed for "a few months" to get the base or seniority they wanted. It took 3 years to get another chance. While it was 3 years with decent QOL it was ~1800 or so PIC lost.