I've played those games. And honestly, I don't think it's actually the skulk that is the problem. It's the gorge.
Just hear me out please and think about it. In both NS and combat, but especially in NS. The skulk is the bottem tier anti-marine lifeform. Quite deadly but dies easily. Yes finding a way to modify a marine movement and/or increase base speed are ok ideas, reducing hitbox size and adding extra HP or AP are very bad ideas.
But in my mind... Who is the healer? Who is supposed to make the structures for the aliens? Who creates the upgrades for the aliens? And in combat, what is the class which heals the hive and teammates?
The gorge.
The biggest problem that I have observed in servers running NS maps is that people don't rush to build RTs on aliens the same way marines rush to get RTs up quickly. The result is that aliens always start out behind unless the teams are stacked. Why don't people go gorge more? Simply because for most people, they find gorge boring and unrewarding. Nobody says thank you for building. And complaining at the end of the game about what should have been is usless. It's worse when you consider that your are so weak that a mere two basic LMG marines (or one marine if he has a shotgun, HMG, or even a GL! Let alone HA and JP!!!) will kill you. So you die easy, you wait forever for res because the rest of the team isn't interested in playing that class. (and I do like playing gorge, but hate going "get RTs please" each game)
So what if a skulk isn't able to solo a competent shotgunner? A shotgun isn't free. Neither is a gorge though. In fact they are both 10 res. Look, let's take a RPG for a sec as an example. You always try to party with a healer yes? Same should be true with the alien healer class. When I gorge I always try to team up with a lerk, fade, or onos. They rampage, get really injured, I heal, and they are ready to go again before marines have had time to recover. Even if eventually the marines get us with the force of the whole team. We have wasted their time and labor resources to a signifigant degree. But really this depends on whether or not they come and kill me. And as I said, gorges die REALLY easy if you are not careful. Oh yeah, duh that's the gorge again...
short'n simple: Boost the gorge instead of the skulk. If that isn't enough, boost the skulk.
As I always say, "gorges win games." I'd be open to any suggestions in this thread to make gorging more fun. It's kind of hard to explain, but do you see how a stronger gorge would make both CO and espeically NS better for skulks? (and whole team really) How do you make gorge more fun? I think people like to build as gorge. I know I do. I also like to play the healer class in game. How can you make that more fun?
Others ideas I like:
Gorges pull resources from a seperate pool
Swap the spit and healspray abilities (would love to have this, seriously what if any draw back is there?)
Gorges have a more effective redemption than any other class (from their better "relationship" with hive)