I've been painting for more years than I care to count.
A good two part epoxy primer and topcoat like Pittsburg Pit-Gard is the way to go on fully stripped and clean metal.Otherwise Rustoleum Clean Metal Primer or Rusty Metal Primer depending on condition of the pole and then of course a Rustoleum topcoat.
Since you started with a basic oil-based primer you can use almost any topcoat but like teaser said stick with the same types and Capesams suggestion of the BM Wood/Metal is a good one.Having painted many flag poles I will guarantee that a Rustoleum topcoat is compatible with the primer you used and it's the best choice in your situation with CS's being a good second.
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