internet speed help

[hotreds]

So I was convinced to pay extra to get "super fast up to 75 MBS" internet speed. Yet, my speed rarely goes over 25MBS. I realize that 75 is unrealistic, but shouldn't I get speeds closer o 40 or even 50? I hooked up to one of those "through the house wiring" devices to get a wired connection, but this seems to make little difference. I was told that the modem is not the problem. HELP! Verizon FIOS.