Not sure about the device you are using or how accurate it is. Surely if you were swinging the driver 130mph + the distance shown underneath the mph should be way over 300 yards. On the driver swing it showed 132mph but only 298 yards. This distance would be calculated with a fixed smash factor (probably around 1.45) so surely this should be way over 300 yards on the device. If your not getting the distance on your driver that you think you should with your mph your smash factor will be low.
I have been watching a few youtube vids of peter finch trying to get to 350 yards and his swing is around 125mph and not to be rude is technically a lot more sound. Even when he steps it up he loses some technical form.
I'm no pro but even I could see many things which I would be working on rather than just chasing club head speed.