Dual Hot Antenna setup

[D-MAX 2112]

Ok .. maybe some input from the guru's PLEASE..?? im running rfs 1/2 superflex hardline with a velocity factor of .81 @ 27mhz so i used the coax calcultor here.. I have now 12.77 ft of coax. So its somewhere between the 1/2 wave 1/4 wave. Am i in trouble here? Im kind of in-between more to the 1/2 wave lenth.

For coax with Vf = .81, 1/2 wavelength = 4.5 m, 450 cm, 14.76 ft & 177.17 in

For coax with Vf = .81, 1/4 wavelength = 2.25 m, 225 cm, 7.38 ft & 88.58 in