I did have to take my antenna down due to the Hurricane we had. But will be placing it back up.
At any rate, my antenna was 27ft to the actual bottom of the base. This would have placed the cone hub arm at about 28ft or so.
My coax was routed down the mast and completely isolated from the mast with 1/2" snap in's and 1/2" grommets made for LMR400 from my previous job as a cell site tech. The coax then was coiled up at the base of the mast and then again isolated from anything using more snap in pieces and 1/2" rubber grommets as seen in the pic below. I did this all the way to my radio room. Then I placed a surge arrester in line. The first length of coax was 60ft and the 2nd piece was approx 30ft. Here are the parts I used to keep the coax isolated from the mast and also from touching my roof or any other part of the house.
I tuned the antenna with the 60ft piece of coax using an MFJ269C antenna analyzer which is pretty close to being a multiple of an electrically tuned 1/2 wave coax jumper. I ended up with the results of
R=50
X=0
VSWR= 1.0:1.
If I could have gone higher with the antenna I would have and when I remount the antenna I plan on getting it up to at least 30ft or more. I have a 40ft push up pole that I just need to pick up from a local pals house. Last I checked which was a couple months ago, the antenna still was at the same readings as I listed above. And boy did it work well for me at the height at which it was at. For only being 27ft to the base of the antenna it did an excellent job for me both locally and DX'ing. If I left anything out I will post more info. I can't see what you wrote at the moment so I am going off what I saw from reading your post.