Sounds like a good start with ya board maxwell!!!!

If it feels good on the first couple of days ridin then that's great news!!!!
With regards to losin speed, how's ya stance???? Too far back on the board and ya will lose the 'plane' of the board and create too much drag, which in turn will put the anchors on, which in effect is actually a useful thing to learn for tube ridin!!!!! (The 'Stall'!!!!!)
If the board is planing fine, then ya might be dropping to low on the wave???? Try initiating ya first bottom turn a lot sooner, or even taking off at a slight angle already pointing in the direction that ya are initially going!!!!!
Is the board 'Loose' or does it have a 'Stiff' feel when ya tryin to turn it???? Stiffer/Bigger fin templates can help generate more speed out of a board, but ya will suffer some loss in "Turn-ability"!!!!!