No one answered?
Ok, I will.
First of, all infusions got some certain number of "Instability", let's pretend it's 10 (Yes, it's actual numbers used in recipes, but you get "low", "high", etc. in books, because aestetics)
This number must be "nullified" by stabilization objects.
Here is List of Stability objects
1) Mob heads (Make sure they all Vanilla heads, says "Minecraft" in mod description. For example "Headcrumbs" will NOT work)
2) Candles (Thumcraft candles, and floating candles from addon)
3) Crystal clusters (doesn't differ what crystals, they all work. But make sure you got same crystals in symetrical location)
4) Nitors (Not sure they hasn't disabled at some point)
Ok, now about mechanics.
1) Altar got stability 0
2) Every pedestal WITH item give -0.2. Every symetrical pedestal WITH item gives +0.2. Meaning if you not place items symetrical, you get extra instability. If symetrical, you get total stability 0
3) Every stabilization item (skull, candle, etc.) gives -0.1. Every symetrical gives +0.2. Meaning if you place items symetricaly, you GAIN stability by +0.1 for every PAIR of items
That's all you have to know.
About RECIPES. Low instability is about 1-3. Means you need about 10-30 PAIRS of stability items. Or 20-60 items total (skulls, candles, etc.)
Medium is about 3-6 (30-60 pairs)
High 6-8 (60-80)
Very high 8-10 (80-100 pairs, or 160-200 skulls, for example)
Instability can go even higher, there is no limit. So, good luck stabilizing recipes with instablility of 40 (Some recipe ment to be unstable in all cost, just a joke from author )