CX-H1300 13.5w can be hit or miss. Over the last few months I've noticed significant batch variance. 2 months ago I test 3 newer batches of It and they performed 2 degrees worse than the original batch. They were also much stiffer. Either someone is selling counterfeit CX-H1300, or their quality control has gone down. My best guess is that since it became such a popular putty they have had to ramp up production and haven't been able to maintain quality because of it.
lately I recommend using Upsiren UTP-8 or Fehonda LTP81 as they have been more consistent, higher performing, and we have people on thr other end we can contact if quality goes down.
Recently I've testing Honeywell HT10000 putty and it is the highest performing that I have tested to date. Looking forward to seeing how HT11000 performs once it starts being sold. Would also like to test Laird T-Putty 910 when I get the chance.