Honestly I'm glad to hear this because from my testing +3 damage was still a little underwhelming, so it's good you found success with it! Thank you for playing!
Its pretty decent, cause it STACKS (which means 3rd and 4th attacks just wreck stuff)
And as long as you are healing up nicely, it allows you to get close to 100 with 2 or 3 potions)
If block created a permanent reduction (for that battle) it would be on par with heal, but as it is, its almost worthless.
Poison, is only useful in long drawn out battles, and these arent even remotely long enough...
Damage to all, is way too low to be useful, sadly. If you were planning on making parties bigger, on both ends, perhaps...
The problem with the splash poison combo is the you are still FORCED to use one of the 3 attribute slots on direct damage.
If you could get the flask to do AOE damage, poison, and heal or shield, it might be more useful.
Also, since, from what I can see, there is a max of 2 enemies, the AOE is sorta wasted, if you could splash poison 3+ enemies it would be cool, but since the moment the first enemy dies the aoe becomes useless, it's just not worth it.