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Norm, do you find it to be more, or less grabby with a fuller diameter? If I went to 6 or 7 tapered, would I likely find it to grab more or less than my current 10? Or are you speaking more in terms of the 'stiffness' of the cord, and how consistently the hitch sets itself on the host line?
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I find it less grabby the bigger diameter it is.
I use the tech cord and TVP, in 5/16's" diameter, for secret weapons and hitch cord. I've found that on Tachyon and Rocket Line with 9 strands removed, it grabs better. With 8 removed, it didn't grab and set as well.
With 9 removed, it sets, grabs and releases very nicely for me. I'm 203 pounds, plus gear. It's gonna depend on climber weight, rope construction & diameter, and hitch cord length.
Mine are 31" in length.
I let a volunteer climber use 1 of my secret weapons for set up at our local comp in May. He liked it so much, he asked me to make him 1. His system was much like mine, SRT up while advancing the weapon with a DRT in it.