Use
http://mwo.smurfy-net.de/ to design your builds. It's an excellent MWO resource.
Here's the stock Mist Lynx G loadout:
MLX-G Not a terribly effective build in my mind; too little armour and not enough ammo for the HMGs.
A simple change would be this:
MLX-G. It replaced the right arm with the MLX-A right arm. The MLX-A right arm has a big armour quirk and a machinegun ROF quirk, but two less ballistic hardpoints. It's still light on ammo but it'll last longer. You can swap out the ERSLs for ER micro lasers to get more ammo, like this:
MLX-G. The micro lasers really don't have much punch though.
If you really want to go with 8 ballistics though you're probably going to have to downgrade to MGs or LMGs:
MLX-G (MGs and HSLs; fire from 120m or closer)
MLX-G (LMGs and ERSLs; fire from 220m or closer)
Here's the build I use for my Mist Lynx:
MLX-G. I find the extra range of the HMLs is useful early in the match where you're just trying to survive.