I do all my own custom profiles for my P900 and the highest measured Dmax values I was getting are:
1. Epson Legacy Baryta V1 (discontinued) = 2.77
2. Red River Palo Duro Soft Gloss Rag (A Platine Clone): 2.72
3. Epson Legacy Platine = 2.70
4. Innova IFA 45 = 2.70
5. Ilford Gold Fibre Gloss = 2.70
It’s a shame that #1 is no longer available. Might check out #4 and #5. Smoother than Platine but having essentially the same Dmax on the P900.