My experience with Mesa's is limited but I own a Roadster and have owned an F100 and a MKV 25. All great amps but I found the recto tone is my favorite of these for metal.
I have found that for really tight sounding, palm muted riffing, I get best results by boosting with some sort of overdrive. Not that it needs more gain. Just more defined, tighter low end. I could get there maybe by raising the mids but I prefer the overall tone when the OD is engaged.
I have experimented with different ODs and they don't all get the job done, or as well as others.
My favorite is the Pro Tone Keith Merrow OD. Very usable as a stand alone OD on a clean channel but sounds great as a boost into gain channel.
I tried the Pro Tone Dead Horse, which the Merrow is based on but it's not quite the same.
I have to admit I have never tried the BOSS SD-1 but sounds like I should give it a try.