Spectra Lashing

[Brion Toss]

Hi Bob,
Sorry to have been so long in replying --- way too much rigging here lately.
The first option is to stay with what you have, or something like it. Multiple Brummels, properly done, will hold close to 80% of rope strength, without any bury, so given a good diameter of rope what you have, though a bit rough-looking, is probably fine.
A true grommet, with a locked Brummel to start, would be significantly stronger of course, and would look much neater.
The lashing might be strongest of all, even with the same total rope mass, as it could have no significant splice distortion, given that a splice would only be at one end, and the multiple turns would share the load. It is also possible to make the lashing quite handsome. As for the effects of knots on strength, the turns and friction mean that you can have very, very little load on the bitter end, so you can pretty much secure it as you see fit.
To make the lashing I'd put a couple of round turns on to set the length, then apply a bit of load, and make the rest of the turns, keeping them neat, and finish with a French-whipping-like series of half-hitches.
No matter which option you settle on, see if the current strop length is really what you want. Of the three options, I like the grommet the best.
Fair leads,
Brion