Depending on the day, you speeds will drop. Try testing late at night, when everyone is not on. You get a more accurate reading.
Also, wi-fi will never get as fast as being hardwired. However, if your suppose to be getting 60Mbps, and only getting 30, then it's beyond a wifi issue. ie. My Mac (hardwired to my router, hits 27-30Mbps (I subscribe to 30Mbps), which is within normal parameters. But my iPhone only hits about 20-22Mbps. These are tested off peak hours.
There is also the question of your modem. If it's older and doesn't support higher speeds, that could explain. Or it's defective. If your renting the high speed modem, have them replace it with a newer one. If you've already contacted them about the issue, with no resolution, have them send over a tech guy to troubleshoot. Could be an issue with cable components outside your house.
And I agree, 30Mpbs isn't bad by global standards. But if your going to be paying for 60Mbps (discounted or not), you should be getting closer to that speed.
Note: Just saw a later thread that you resolved this. So it was the modem then. Glad you got it worked out. Nice speeds.