[TowerTalk] MonstIR 40<>6M and a damaged tower questions.

[w3pt at comcast.net]

Hi!
This is my first post to this group and I am looking forward to your input.
I just lost my stack of F12 antennas when a cable snapped on my 5 year old U.S. Tower HDX-572MDPL while at full height. I may try to repair the tower or replace it. Here are my questions.
1. If I repair the tower and install stainless steel cables how much should I de-rate its lifting weight?
2. I also thought about extending the tower (with a crane) to full height and attaching clamps to the sections and make it a non-retracting tower. Have not found a suitable self supporting tower that I could adapt to the present base. Any ideas pro or con?
3. I ordered the newest/largest MonstIR 40M<>6M antenna to replace my stack. http://tinyurl.com/a2v25 (Looks like no more SO2R) I have been searching the WEB for owners of this newest release by SteppIR but haven't found any. Lots of the 20M<>6M antennas out there. There are 11 of us on the waiting list. Any info from current owners?
4. Are there any other U.S.Tower owners out there that have had this problem with cables breaking in such a short lifespan?
Thank you,
Bob, W3PT