From what I can tell, the problem for Salamence is the lack of speed vs OHKO users just as much as the SD vs DD thing. Someone posted a useful list of OHKOer speeds after tricking them the scarf and Garchomp is 'safe' for a lot more than Adamant Salamence. I've gotten lucky with misses so far trying to work around it, but Garchomp's speed would be useful. I'm still trying to find that post again and see if Jolly would be better...
Nice to see all of these new one sweeper +stealth rock teams. I was kicking around something similar ages ago with a sturdy pokemon as the second crippler that I could never quite get to work.
EDIT
http://www.smogon.com/forums/showthread.php?p=2347527&#post2347527
Here we go. And Bozo had the same Jolly vs Adamant Salamence discussion as well earlier. And the EV spread analysis. Hmm.
Incidentally, why are you using the EV spreads you picked? It looks like you have the potential to be screwed over by OHKOs, perhaps pushing Empoleon to 81 speed to outrun Sheer Cold Lapras and Abomasnow would be useful? I have 252Attack/6SpD/252Spe at the moment on my Salamence without any real good reasoning behind it. And any chance you have a list of struggle strength categories you wouldn't mind sharing?
I only saw four that fit in the Salamence prob/Garchomp no prob category. They all have SE attacks vs Latias, three are STAB. Three of them are faster than Garchomp if they have a plus speed nature.
If you're talking about my current Salamence spread, I'm going to change my extra point from HP to Def, Porys don't concern me. If you're talking about my recommended spread. I think a 43 point substitute will be more useful than the one point of Attack and Speed.
In terms of Struggles, I just go by the Attack values in the database, and experience gained from battling.
@fluffyflyingpig I'm using Platinum.