I live in a antenna restricted community!

I have put up a somewhat stealth antenna.
It is a 540 ft loop = 180 ft virtually lays on the roof and the remainder
360 ft is in my attic.
I feed this with 50 ft of RG58u at the center point (6 turns of the
feedline - approx 8" dia is used as a RF choke) running down to a manual
tuner.
The antenna in this configuration is about 1.5:1 across all the bands from
75m to 6m. I would like to operate on 160m, but the tuner doesn't cover
that band, and when I try to go directly the SWR is extreme and we don't use
it!
My questions a
1] should I leave the antenna system alone as is? It works - but as a
wire system has its limitations due to the clearance off the roof?
or
2] should I purchase another antenna tuner that covers 160m - 6m. and
open the LQQP and make the antenna a single 540 ft piece of wire and ground
the other side?

73's