Bombproof Tech cord
I've been climbing on my HH as much as possible, since I got it last fall. I seemed to be burning through hitch cord far more quickly than I do climbing DdRT. I climb a lot, being a freelance production climber, and I've been splicing my own eye2eye's for a few years. They seemed to last about two months during peak seasons climbing DdRT and I often retire them a bit early, being as it costs me so little to replace them. Though cost isn't a factor at all, I found that I was burning through the same cord (8 or10mm ocean) in half that time climbing SRT. Admittedly, I am a bomber. I don't slack on safety, but I love high speed maneuvers through wide spread canopies and repells that warm the hands.
I bumped into the friendly rep's from sterling rope at the NE-TCC in May, and we spent a good while talking about SRT, as I was headed to the very first SRT class/workshop ever offered through TCIA, directly from the competition. The class was awesome and I picked up a ton of tricks and techniques, and have since spiced/built my own HAAS (I think there's another forum for pics of that...) After a couple emails back and forth, the rep from sterling sent me a length of their RIT 9mm to try with my HH.
I was a little skeptical at first, seeing how the cord flattens when coiled to provide more surface area, and I thought it would bite too much and be tough to break. Instead, I've found it to be perfect! The double overhands set with the first weight test, and even throughout a 2-3 hour climb, the hitch never locks or requires tightening! Plus, after a month of climbing on it for 70-80% of my time in the trees, the cord is nothing more than broken in (that's it in the pic, and a brand new one to be put into service if the first ever wears out.)
My primary line is tachyon, and for big climbs and basal tie-offs, I climb on a 300' 11.5mm platinum (cuz its orange...) I was just given a 200' HTP line, which is only 10mm. Not taking into account any memory that the hitch cord might have, it gripped sufficiently through 95% of my climb. Only returning from a limb walk, with a 3-1 advantage, did I have a pucker moment when it didn't bite.
I have only found one site that sells the RIT 9mm in un-spliced lengths. Unfortunately, it's in 70' or 110' lengths. You may have to contact sterling to get anything smaller, to run in your HH. If there is enough interest, I may go ahead and order a long length to re-sell/share in pieces cut for the HH.