I seriously doubt it's Pulse causing this issue nor would you get better performance hard wiring your PC to your cellular Internet. If you are getting good performance initially and then over time it drops off, I'm more apt to believe you're hitting some data cap which is causing a throttle down of your service performance. I don't know what plan you have and if indeed you're hitting some cap. You can check this by logging into your account to view your usage or call Verizon support.
If you really want to try a hard wire connection with your Verizon service, you can get a Cradlepoint router and install the SIM card in your Jetpack into the Cradlepoint.
If you really want to try a hard wire connection with your Verizon service, you can get a Cradlepoint router and install the SIM card in your Jetpack into the Cradlepoint.