When I compare these Captain Earle blends, it's not the strength that is different to me, but the character of these blends. They are all fairly hefty compared to a lot of others out there.
Here are my impressions--your mileage may vary...in order of strength--for me.
Mystic--great taste of Orientals blended with the Virginia and Latakia--a unique taste to this blend.
Private Stock--another blend that lets the Orientals shine through and again, a unique taste all it's own. Slightly fuller than Mystic.
Diamond Head--Sweeter due to the Red Virginia, I'm sure, and a bit more Lat presence.
Nightwatch- Less sweet than Diamondhead, and more Latakia--a fuller one.
Ten Russians--definite presence of unsweetened Black Cavendish, Orientals and lots of Latakia---a very stout blend.
Stimulus Package--even more Latakia, without the Cavendish--more a ramped up Nightwatch.
Honor Blend--No Latakia here, but I find the N content of this one almost too much--great taste until I start palpitating and hiccuping!
I'm very fond of all these blends--I like to cut the blocks with a sharp knife against the grain so you have a broken flake, put them in jars and let them age.