This is most likely because peroxide boosted products like Dynamall and Hydrox are on the acid side of the pH scale so need longer dwell time to achieve results over alkaline encap products.
The SPM according to the MSDS is ph10.4. ON that particular occassion one of the non boosted encaps such as Releasit DS2, Surround Ultra, Prochem Procaps may have performed better in one step.
Additional padding with an absorbent pad will always help. On first visits we like to hit the whole area with a scrub pad first then when dry (maybe the following day on large restorative cleans) and vac the bad areas then run over with bonnet pads for a second highlight clean. This gives us the same appearance levels that prespraying, scrubbing, extracting, padding then LM cleaning when dry used to give us.
A sodium percarbonate booster (Chemspec Energizer, Prochem Oxibrite, Craftex Energybrite) with these products will help if organic staining is present.