I hate to be That Guy that brings up Solar Craft Charms from the Power Tree again, but ...
How does Holistic Miracle Understanding work exactly? I can't seem to find a definite answer anywhere, and it and Divine Inspiration Technique are not worded particularly well. I'll quote the two Charms below just for easy reference, but I recognize you've already clarified
DIT's effects on Craft rolls.
A direct reading would indicate that when you roll the non-Charm dice from Divine Inspiration Technique generated from the initial Craft roll (i.e. for the very first time during this Craft roll), if those non-Charm dice generate 3 or more successes all on their own, add an additional 3 non-Charm dice to the resulting DIT-generated dice from them creating additional multiples of 3 successes for the overall successes.
So, if you get 29 successes off the initial roll, you get 9 more non-Charm dice from DIT. These dice generate 4 more successes, giving you 33 successes total and an additional 2 non-Charm dice from DIT. HMU activates because those 9 DIT dice gave at least 3 successes by themselves, giving you 3 more non-Charm dice. You roll those 5 and get another 3 successes, bringing you to 36 and another non-Charm die from DIT. This is no longer the "initial roll" and so HMU doesn't give its 3 non-Charm dice.
Only ever getting 3 non-Charm dice from this Charm seems really underpowered to be the effect of an Essence 4 Charm, considering the effects of other, lower Essence Charms in this tree. So perhaps a literal reading of the Charm might not be the approach here.
A second interpretation I've seen is that HMU upgrades DIT to give 4 non-Charm dice per 3 successes on the Craft roll rather than a single non-Charm die. That seems ... rather overpowered, but I have a hard time gauging what effects are in keeping with a given Essence level.
A third interpretation would be to add 3 non-Charm dice after any
use of DIT whose dice generate 3 successes by themselves, ignoring how those successes might bring the total Craft successes to a new multiple of 3. So having 31 successes on the Craft roll and rolling 2 more successes from DIT dice would not trigger the effect of HMU, even though it brought you to 33 total successes and generated a new non-Charm die from DIT.
I feel like I've rambled on enough on this; this is something that's off-and-on occupied my thoughts. So I figured I'd ask now that I have an account. Any clarification you can give would be really appreciated. Thanks!