its not perfect but you won't notice a difference on air if 27.055 is the frequency you want the antenna tuned for,
is that with the analyzer at the antenna or through coax ?
when making an impedance chart like you have above with a mismatched antenna measuring through coax,
the only frequency that what you see for R is what the antenna measures is the frequency where your coax is an exact electrical 1/2wave or multiple halfwaves,
on other frequencies where you coax is not an electrical 1/2wave the coax will transform the reading to some other value depending on its electrical length at the frequency you take the measurement
unless the antenna is 50ohms or a perfect match to your coax,
then coax length does not matter, a perfect match will read the same through 10ft 15ft 20ft of coax etc,
on the other hand vswr should not change much with coax length
providing you don't have common mode on the braid vswr will read a little lower the longer the coax is due to loss in the longer coax,
if you do have common mode on the braid, vswr will likely measure different with different lengths of coax.
best thing is put the analyzer at the feed-point or use a few inches of coax to allow the connection if you can't screw the analyzer to the vectors so239 & use binoculars to read it from a reasonable distance,
move the frequency & stand back again take another reading etc,
that way you don't have any coax effects or your body close to antenna to worry about,
resonance & impedance will be what the antenna measures & you can tune for r=50 x=0 on the frequency you want it tuned for,
sounds crazy but it can be done like that if you are OCD about getting your antenna as perfect as your analyzer allows.
