I flew with the SPW and 3 turn Helix today. IMO I got very good results. I beat a personal record and hit 2 miles with ok video. The SPW is to your specs, and the Helix got a new tapered impedance strip per your instructions.
It is not fair to comment fully but I will post the video anyways... I later found out the video wire had a loose/cold connection, so I did have video fuzziness but not likely due to the antennas. Due to this I couldnt test the cloverleaf today.
I can say that I had no apparent multipath problems (at least in comparison to previos experience with the V and a patch), It was very nice video with the regular maneuvers an easy star does. I only had a few blipps, probably temporary nulls and interference in the city. Looks like it is time ot build a higher gain Helix?