Okay. So Hybrid Armor allows you to switch all styles without penalty. The accuracies, I believe, are 100% (of your total) for the style strong to the target, 66.7% for same, and 33.3% for weak. Therefore, by gaining strong across the board…
Average: 100%
Average normally: 66.7%
Gaining 33.3% accuracy.

However, let’s look at what you lose with 15 levels. Life bonus is negligible if food is involved – a shark’s worth at most. However, if we look at the lost armor bonus…
Someone worked out the exact bonuses, so according to that, armor bonus is based on a cubic equation. Therefore, the loss is the level change cubed.

At level 75, the best Hybrid armor in the game, the 15 level loss drops it to 80% of the level. 80% cubed is 51.2%. So it loses 48.8% of the armor bonus.

Thus, comparing your opponent’s accuracy gain to yours, they actually gain 15.5% MORE accuracy than you do. This makes Hybrid armor 100% not worthwhile.

If we downscale that to the lowest level, Void, you drop to 64% of the level. This cubed is 26%. So you lose a massive 74 PERCENT OF YOUR ARMOR BONUS.

However, this disregards inherent armor bonus. Which is roughly half of your armor bonus. So you end up losing 24.4% and 37%, respectively. Thus the net gain for Warpiest is 8.9%, and of Void is -3.67%.

We’ll base the math off of warpriest, which will have the largest potential level loss to still be fair.

8.9%. This is less of a bonus than Power Armor, which gives a 10% damage bonus. Also, it requires weapon switching, which adds cooldowns and such. So let’s set our objective at 15% net accuracy gain. Your gain is always going to be a constant 33.3%. So the loss needs to be 18.3%.

So incorporating inherent armor, the loss needs to be 36.6%, or a remaining 63.3%. The cubic root of this is… about 86%.

So it needs to lose 14% of the total levels. 14% of, let’s say level 60 for a middle number…