Hi Martyn,
I built a Hog from the Sig kit some years ago and reduced the dihedral to about 4 degrees. This was in anticpation of building the Ryan STA Special that has a similar dihedral. Twenty years later still waiting to start the Ryan.
The Hog flew extremly well in all conditions, I am tempted to build another or at least another fusalage as I still have the wings and tail plane.
You will enjoy it and good luck with test flights
DA