Quote Originally Posted by DemostiX View Post
Yes, you can bury any line in any other Dyneema line, and it will constrict on it. Sew some stitches to stop it from slipping before tension is applied.
Please be careful with this advice. OP is possibly talking about 2 different diameters.

Quote Originally Posted by DemostiX View Post
I've asked around about whether the current recommendation of 70-72 diameters is because of slipperiness or because of greater tensile strength.
Both. But common sense should provide the answer since fid lengths increase with line diameter across all class and constructions.

Quote Originally Posted by DemostiX View Post
(Polyester line is 1/3 the strength of Amsteel, so it doesn't have the opportunity to slip at greater loads. It has already broken.)
What type of polyester line? 12 strand single braid calls for 2 fids while double braid calls for 1.

Quote Originally Posted by DemostiX View Post
I haven't gotten an informed answer.
You just need to ask the right person.