Those items are fine. The formula for instability “cost” is a bit more complex.
There is threshold after T3; low tiers T1-T3 and high tiers T4-T7 are treated differently:
- Any tier above threshold always costs 2 instability.
- You get 5 below threshold tiers for free, exceeding tiers cost 2 instability each.
I’ll try to visualize this with couple of examples. Each star in the following examples is one tier, I added space to separate above threshold tiers.
Example 1: 5/1/0/0
*** **
*
This item has total 4 tiers below threshold, they cost nothing because you get 5 tiers for free.
2 tiers are above threshold so the total cost is 2 * 2 = 4 instability.
Example 2: 5/4/3/2
*** **
*** *
***
**
This item has 11 tiers below threshold, first 5 are free so tiers below threshold cost (11-5) * 2 = 12.
3 tiers are above threshold so the cost is 3 * 2 = 6. Total cost is 12+6 = 18 instability.