Two great looking boards Dave ,

as other have said you need the little fin in the middle
helps hold a good line on a wave ,in the old twin days we use to make and glass a little fin in after buying ,
as they had the tendency of not being able to climb the face of the wave again and sit in the bowl ,when
SImon Anderson invented the thruster it was a god sent .Some even had fin boxes where you could slide the rear fin back and forth .

slide up back for bigger waves forward for loose

usually you find the sweet spot and leave ,