[TowerTalk] Christman Phasing help!

[R. David Eagle]

Hello all,
Let me preface this by saying this - I am NOT a phasing expert by any means so I thought I would tackle a new antenna project this summer and maybe learn something....or lose more hair!  So any ways...I decided to put up a pair of phased 1/4 wave verticals and phase them via the Christman method.  Each antenna has 2 raised radials.  I ran across an article by W4NFR where he did exactly what I am attempting, BUT I am getting different results....naturally.  I tuned each vertical to 7.100 exactly trying to get the lowest possible reactance on each.  I checked and double check the RG-213 71 degree delay line and the 84 degree feeds to the verticals.  Now, here is the puzzling part - when I put everything together in  my homebrew directional switch box, my resonant frequencies are considerably higher when I switch between Northeast, Broadside, and Southwest.  The resonant frequencies are near 7.450-7.500  where R=39 with X=6.
So I must be missing something here.....Anyone else had success with this?
Any help would greatly be appreciated!
DaveKB8NNU