I say 5. 5 seems fair and with the Achlyophage symbiote, it'll go up to 7. That's the best way to deal with the gunslingers weak subclass in pve. Hammer of sol can kill at least 2 majors and gunslinger can nearly kill 1 -.- 5 shot to gg and 7 with exo helm seems like a fair trade off. As for hammer of sol, increase armor further and make the titan even slower. The power of the sun in a hammer should also weigh as much. Fastest you can move is maybe crouch walking speed. Anyone else agree or got better ideas?