...is there anyway to better secure the storm windows for added security?
Sure!
Rolladens!
I had non-locking, plastic composite rolladens in my apartment in Germany. When the inland hurricane started hurtling branches against my windows in the Fall of 2005 in excess of 70 mph, not a single one was broken, despite some rather serious collisions.
They also come in hardened aluminum which, when locked, makes it very tough to breach through a window.
An additional benefit is that if you lift them slightly, there are narrow perforated gaps between them which allow air to flow and a little light to come in. If you'd prefer no air or sunlight, just release the tension.
A final benefit is that when they're fully closed, the dead air space between them and your window just about doubles your windows' R-value, while the physical presense reflects the heat, that is, it keeps the heat either out or in, depending on whether it's summer or winter. My apartment there was double the size of my current apartment, yet my heating bills were less than half of what I pay now. With the rolladens up (first winter), my heating bill was about the same as what I pay now.