Well I am on Ultrafast 2 Plus with is BT's current fastest home Package via FTTP and ours is no way near as bad as that and never has been.
Looking at the BQM's I would of put you as having FTTC, if I was you I would phone BT to look into it, even on FTTP there is a lower limit which I was told was 34 to 45Mbits (assuming you was on the 300Mbit package) before BT would class it as a fault.
Not too sure where you are from or how far you are from London but if you are on the 300 - 330Mbits package and from London you should be getting around what I am getting on my speed tests and BQM.
Maybe you have a damaged fibre cable ?
Maybe your exchange is needs upgrading or a few of your neighbours (on the same splitter node as you) are hammering their connection.
But I would see what other people say first, before you phone BT.