The RS-R pad is somewhere between the Hawk 5.0 and HP +pad. Hard to tell, but their temp chart, plots them right in that range. I don't believe mountune has a custom formula from Hawk at all, it's just a rebranded pad of one of those two compounds. Most likely the HP +, due to it's max stated 800 deg temp.
I can tell you the Hawk HP+ pad is amazing. It's the minimum performance pad to use for any aggresive or track driving. Don't bother with HPS, those are junk IMO. The 5.0 has no history nor pedigree, other than being their newest pad compound.
The HP+ can dust a lot, but depends on your application. Slotted rotors only make it worse, as it's constantly shaving off a bit of the pad face each time you apply the brakes. This is a good thing! I've had them squeal on a different application, but generous application on the pad backing plate of a thick paste (anti-squeal stuff), and ensuring the caliper pins are lubed and free moving.
Then comes the proper bedding in process. You must perform 8-10, 60-10MPH high speed panic stops. Back to back, the only break your brakes see is the time it took you to accelerate from 10MPH to 60MPH, then apply the brakes again, HARD. After performing 8-10 of these panic stops, you drive around for at least 5+ min like normal, NEVER coming to a complete stop. Allowing your brake system to cool down gradually. Your pads are now bedded. You can do this anytime from 0miles, or 100 mile or 1000miles later. What ever happens after that, will be forever how your brakes will perform going forward, until you change rotors.
The pictures shown above, tell me these were not bed in hard enough. All rotor cross hatched marks would have been gone if done properly. I see pad material starting to be transferred, but not nearly enough.