Wavestorm, 45 degree going down the line, how to keep speed?

I can manage 2-3ft surf pretty well in the sense that I can comfortably going down the line at 45 degree (front side).
My board is the 8ft Wavestorm.
Big problem for me though, is that I get good speed immediately after pop up, and maybe for 1-2 seconds that follows. Afterwards I seem to slow down -- well in my beach break each surf is about 5 seconds anyway.
My question is: how do I keep speed, or even increase speed, in situations like this?
My board is the 8ft Wavestorm.
Big problem for me though, is that I get good speed immediately after pop up, and maybe for 1-2 seconds that follows. Afterwards I seem to slow down -- well in my beach break each surf is about 5 seconds anyway.
My question is: how do I keep speed, or even increase speed, in situations like this?