You did a nice job collecting the info. I'd give you 3 stars if you only included this info, but there are some weapons missing (blasters and bucket specifically) and also misinformation in saying that damage up isn't useful just because it doesn't reduce the time to kill.
There are two situations that damage up are useful. After the straight frames end there is damage fall off towards the end of your range. Damage up effectively increases your range. Also in firefights it's pretty common for squids to not be at full health. Having a bit of damage up can reduce the number of hits needed in this situation.
On blasters, damage up increases the radius of the one hit kill, so you can be a little less accurate.
On buckets, there is a lot of damage fall off when attacking from a high point. Damage up will help keep the bucket at a 2 hit kill.
It's good info, so if you fix those issues I'd give you another star or 2. If you did some squid science on the damage fall off for all the guns, I'd give you 5.