I've used quite a few.
Nikon Monarch 1-4X
Bushnell Elite 4200 1.25-4X
Weaver Classic 1-3X
Optisan (Very/virtually similar to Millet DMS/Bushnell Trophy XLT,etc.) 1-4X.
All are as far forward on ANY mount as I can get them. 1-4X's seem to simply have too much eye relief, except for few. All of my scopes also use "extension rings" which move the scope forward about 3/4". Alot of people don't like the Weaver "clamp-overs", which is all that's available. I don't have a problem with them, and they are solid once they're on.
I couldn't use the Optisan because the eye relief was just too long, and the Monarch was barely usable.
The Bushnell Elite has a shorter eye relief, and isn't a problem.
I like 1-4s, will continue using them, but it's a shortcoming shared by ALL mounts, TWS top cover mount as well as almost all 1-4X scopes. I haven't tried a Leatherwood CMR, but with it's eye relief of 3.12 inches, it should be about the best choice out there.