solid piece grats on finishing :) think face could be pushed further, variations in spec map as well could be pushed further, like little or no spec where dust and dirt occurs such as in the recessed areas, which i think you have, you could also have slightly lower spec on lower portions of the model with bottom areas of…
i think that at the time i was trying to use landscape splines i was working on a computer that was a bit under recommended hardware specs, so that was likely the major reason it was slow and buggy for me. Haven't done it now that I have machine that's above recommendations