To be completely frank, I don't see how the unfortunate inevitability of the individual who is inclined to use what is presented in a manner of "power play" has to do with the spread of stat increases in Digimon Families. Also not sure I follow on your mention of "complicated house rules".
While I can respect the character coincidence, I must point out that, out-of-the-box, the GM has about as much say in Digivolutions as the player, being that the player would mention to the GM which are preferred, and work theron, while the final decision is up to the DM.
I am completely open to making version updates. In fact, I will do so, plus a modular addition detailing ways to have players use Royal Knights and/or antagonists be the legitimate Demon Lords, sort of a "Heroes and Heretics" expansion if you will. However, I would very much like to run version 0.1 at least these two times, as this is being done to gain a bit of scope.
I personally can't justify a use-per-day system for a Digimon RP as it stands, as the majority of standard and repeatable actions in tabletop RPG's are weapons, and the majority of Digimon don't wield weapons. That and defining the line between what costs energy and what doesn't could become bothersome. Like, is every swing of Seiken Grandalpha a standard attack, or would it be a skill? The same with uses of Gallantmon's lance, or MetalGreymon's claw, or BanchoLeomon just, like, punching things. Perhaps the initial concept is not efficiently communicated by way of what limits the use of Techniques. The Energy costs probably earn a second look.
And, upon that second look, I realized I forgot to change the energy costs when I copied the format. Now I feel sheepish. Things should be more expensive now. That and, even if you get maximum energy somehow, a Rookie can use a Force based Technique five times (if I did my math right) before not being able to anymore without an Energy replenishing item or rest. Also, I clarified how the active stats grow on level up, and changed some wordings here and there, specifically with Weight.