Two questions. First are the Propel Pads safe to use with the Sonus Flexplate? Second I have the the Sonus DAS Pad Kit and was looking into buying the Propel Blue and Green pads. Is there any reason to add the Grey finishing pad? I will be using Menzerna IP & FPII followed by Zaino on one car and Menzerna IP & FPII followed by AIO and Pinnacle Souverän/P21S on the other. Thanks!