Bumping up to RS-MaxxMudd -S (standard) is a good compromise that assures you of the needed gain, yet reduces most all chance of seeing any graininess if sprayed on.
The SF v2.5
equivalent that would have near the same gain yet do a bit more black level enhancement would be the 2.0
It too has virtually no reports of Grain / Sparklies.
The best thing going for us all has been the recent (2-3 years) of metallic ingredients that are of fine granular consistency. This has allowed more "packing" of metallic content, and when additional masking was needed, the addition of more UPW as a balancing factor has also served to mute granularity while still maintaining gain levels.
BTW, the tendency to see such artifacts is traced back to the angle by which the projected image hits the screen. The lower toward screen center the Lens is as relates to viewing angle,the more potential that the structure of the surface can be resolved. Most Ceiling mount situations are absolved of such, excepting when a PJ is very high up and the viewer is very low, which works to present the sane viewing angle of reflection when one gazes upward at a angle.
That explains why the few who are troubled with such have not / did not see such artifacts until they changed seating positions / arrangements. Also, the ability to resolve slight texture / grain varies widely among people. Those with 20/15 vision or better ( Lasik patients) are the most affected. They seem to view the world under a Magnifying glass.
But in the all in all, not much is offered up these days in the way of complaints about graininess unless it really seems to come from those determined to create an issue about it. That usually involves those who simply discount the use of such metallic s, and who by the very nature of things have not themselves ever tried such an application.
Even so, sensitivity to such proclamations is what drives the continued advances in these type mixes. Trying to make them be acceptable to all the more people possible without detracting from the performance their very design allows is what DIY Screen Alchemy is all about.