Hello!
I am uncertain if this should be a bug report or a suggestion, but here goes:
As of now, each level of Focus increases attack damage by 33% and cooldown (time between attacks) by 50%.
This means that on lvl 3 the attack does 199% damage and has 250% cooldown.
Now, shouldn't the lvl 3 do double damage? As of now, that is not always the case:
For example it takes a vanilla skulk 16 bites to take out an Armory, while a Focus skulk needs 7 bites.
The question is SHOULD it (as of now) do double damage, in that case it is a bug which should be fixed.
If it is intentional, I would suggest changing it.
Seriously, it would not make a very big difference but since most of the time you have either no Focus or you have lvl 3, it is much nicer with even numbers.
Edit:
Realized that a reasonably commonplace situation is Focus Skulk vs vanilla marine.
I haven't tested it yet myself but in theory the marine got an effective health of 160 (10 + 30 armor), parasite him and he is down to 150. Now it would take 2 bites to kill him even if you have Focus since bite only does 149.25 damage. Same thing when a lerk bites a lvl 1 armored marine (effective 200 health) when it takes 4 bites normally and 3 with focus.
And so on and so forth.
As of now, Sensory is not very much used on the servers i play (almost always chambers in the order: Movement, Carapace, Sensory, with the occasional swap of Carapace for Sensory) and this might be appropriate to change. But I'm aware I cannot see the whole picture and thus this would need to be discussed throughly, before any change since it might change the balance.