I've always been glad the "plans" tell you where the CG should be and I've never had a problem staying within the specified range until this little bugger and I'm really glad 'cause now I'm really confused.
For the type of plane it is "supposed" to be it is necessary to keep up a lot of speed on landing or the prop will throw up a whole bunch of grass !!! From earlier info I'm "guessing" that MAY mean it's nose heavy even tho the balance point is dead on according to the plans.
After rereading, maybe I said it wrong in my earlier post. The fact it "porpoises" AND has a fast landing speed is what confuses me. Thanks for correcting me on which side of the CG I need to add an ounce or two to see what happens.

Dan
Note: I spelled porpoising like 1320Fastback and didn't get all the red squigly lines lines telling me it was misspelled, now squigly has 'em, I give up !!!!!!