In my opinion, the best rebuild strategy is to get a few rebuild cards and sit on them while working on cleaning up derogs, worry about keeper cards further down the road, applying now only risks wasted inquiries for possible denials or approval with toy/bucketed limit that will probably never grow, like your CapOne Platinum. You have plenty of cards to rehab your profile, adding another toy limit card is not going to speed up the rebuilding process, just prolongs it.
Hit the garden and work on growing you Discover with SP CLIs, graduating Citi, PFD the collection (huge gain here), good will the 30 day late and let inquiries and new accounts hit their 1 year thresholds. Be patient, soon you will be here talking about 700+ scores, keeper card approvals with decent SLs and closing some of the rebuild cards.
