Are you like, not changing modes? Because that's the only reason that sorta thing would happen. You need to change frequently to make use of both the Beam Launcher and VSBR for a consistent long-range game, and the main mode weapons have plenty of ammo. The Beam Launcher and VSBR also hit pretty hard too, so I don't know what sort of crack or terrible playstyle you're using. If you're telling me F91 has firepower issues, you're clearly not making good use of both modes.
Of course, if you'd like to show how easily its crushed, I'll be glad to see how amazing your HWS gameplay apparently is in a 1v1.