this was my approach - I wanted to make sure only the 4 RPs were used - each one (RP) was virtually lights-out against one side of the plate and tried to match-up my starters against my opponents - lost first round to a team from a division that produced both finalists, in addition to the team that beat me (total of 3 playoff teams from that division)
used '*' starters so I could use any one of them as frequently as possible. the LH thing is just my eccentricity (some of you know that)
https://365.strat-o-matic.com/team/1535789 had an early injury to Howe
I think you could use a 4 man rotation and make sure your mandatory 5th SP is SP only and just never use him, as so many seem to do