Absolutely they will hold yotes if fully built to the hilt. I do it routinely with the 3 dozen I made up. I start with Dukes, baseplate, laminate,use #3 American chain, MB cruch proof swivels,bend the jaws up and bubble,nitelatch,put in a heavy brass pan bolt and most important... #2 music wire springs. I have not educated a single yote....LOL...but have removed loads from the gene pool with these traps.
I use these fully modified 1.5s as a special purpose trap and would consider it on par with 4 coiled Bridger #2s in performance comparisons. To do all the mods is LOTS of work. There are much better time/cost alternatives out there.
My choice of yote trap is the MB 650 O/I laminated and what I normally set where I can use them. Haven't had any problems educating them with these traps either....LOL.
Here's a pic for you.