I have 2 theories as to why Revolve began to fail for Albus:
1. The demon lord was countering it slightly bit by bit after gaining Fionna's memories. He's clearly capable with magic and highly intelligent. Simply transferring to Fionna every time and boasting while dying could be a way to hide this.
2. With Albus constantly speeding things up cycle by cycle, even of the spell were incredibly efficient, his magic power and mana capacity were probably smaller than the previous cycles, potentially resulting in drawbacks to force the same start point. Although the Revised Revolve was relatively inefficient, they were able to send the world back into an earlier point of time with the combined magic power of everyone, seemingly without intending to do so, suggesting that temporal coordinates aren't part of the formula.