I like what you did.
Look at it this way. For the sake of discussion, let's assume the entire league went with a conventional five man staff priced $6-5-4-3-2. All things being equal, assume any SP vs any another SP
of the same price results in a draw. Each pitcher goes 15-15 on the season. But if you bump your $2 guy in the number one slot, your 6-5-4-3 now match up against everyone else's 5-4-3-2 for the entire season. You have an advantage in 80% of your pitching matchups (theoretically) throughout the rest of the season. Not to mention, run support typically goes higher as your batters face progressively less expensive pitching.
HOWEVER...I've tried this lots of times in lots of ways with various twists and it almost never works out the way it should in theory. Other managers use four *SP staffs. Some use 6-7 man staffs with match-up pitchers. Some use low dollar staffs. Some use high dollar staffs.
I've found in my own experience, that if i just throw out my own $6-5-4-3-2 in order and on autopilot, it usually works out better for me.