Need ideas to stop porpoising?

[gss036]

I was out again today, every thing's running smooth, looks like I am going to be getting between 7-8 GPH at 3600 RPM and 26 MPH. That is also including runnig the 15 HP Honda kicker for about 6 hours each day. So, maybe I am closer to 7gph. I was hoping for a little better but that is really better than the old Merc 200 carbed engine.
People want too much $$$ for fuel flow guages, I could have gone for Honda digital guages w/it for addition $850. That is pretty expensive to how much gas you are burning. It doesn't feel so bad now that gas is back down to $3.37.9 here.