I fly a vanilla VHF, the Mk II Anubis, better known as the Nephthys. Now, I do try my hardest to stay away from having missiles/mines from hitting me as 4 out of my 6 guns will die if I lose both ends of my ship (which is why I put my codenames in the middle slots, so I at least keep some sort of firepower).
Decreasing armour on ships, well maybe that's a good idea. Though I am used to my 36,250 health (14,500 x 2.5), I can easily adjust to a lower amount. Remember when we had the Mk VIII upgrade increase your armour by 2.7? That made fights even longer than they are now.
This isn't a PvP example, but here's still a good one: I took a mission from Battleship Isis, for some random amount I can't quite recall. After killing some fighters, they brought in capital ships. So I said to myself "Okay, this is gonna be pretty hard but I can get through it." I was wrong, a missile from one of the Bounty Hunter Destroyers hit me. There goes 4 out of my 6 forward guns, leaving me only with my pair of Solaris Codenames and my turret and Mini Razor. Even though I still had the capital ship killing weapon, I'm a pretty bad aim with it. Seeing as Solaris got nerfed to 4.00 rate of fire from 5.00, I was doing my best to try and drop them. Eventually after a lot of dodging of capital ship weaponry I did it. But then again, I had to suicide because I had lost a pair of Nomad guns and my Reaper Mk V's. I didn't wanna have to do that but I did.
Increasing projectile velocity may work, but I think working with mixed projectile velocities makes you a better aim overall. Currently I have a pair of Vengeance Mk V's along with my codenames and Nomad Blasters. The Vengeance has a significantly faster velocity of 750 m/s compared to the other weapons' 600 m/s. Now admittedly I'm a pretty bad aim with those because I was using all 600 m/s weapons before a couple days ago, to have everything sync up (I even had the rate of fire sync'd too, all 4.00). My reasoning for changing such a "perfect" setup is because I need to be able to perfect my skill with other weapons. If I'm in another character and say, the weapons he may have are 500 m/s or 700 m/s, I'll be no good using them if I've been using 600 m/s weapons for hours at a time.
In all honesty, to sum things up, here's my opinion: Sure, go ahead and make fighters have less armour, but you don't need to increase projectile velocity. If you can train yourselves with different rates of fire and different velocities, you'll be the master of them all and have the advantage no matter what weapons that character may have. That's all I've gotta say, really. Soon I'll swap my Vengeance out for Magma Hammers to see how I can deal with 500 m/s and 600 m/s weapons working together.