I noticed that my "rhythm" seemed to be off when I had used all of my IFT's and had to wait until the first of the month to get back into one of the funds after selling. I don't recall all of the technical talk about the end of the month and the first of the month, but it seems like I remember some talk about fund managers and such doing things at the end of the month that seem to prop up gains in the first week of a new month. But, for whatever reason, I decided it was better to be invested into the new month, then spend my first IFT to get out or reduce. Then there's that re-balancing that goes on at the end/beginning of each quarter; you've got to be aware of that.
For whatever reason that I'm no longer sure of, I'm trying to hold what I've got until after the new month begins. I'm 50% invested between C & S Funds and my goal is to hold that stance into August then use my first IFT at my discretion to buy more or sell.
So, I guess you might say I don't have a clue and your guess is as good as mine.