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Wow that's a lot! I only do 15 seconds of gentle agitation every 3 minutes when I'm not stand devving
It's not an unreasonable amount, and it's the instruction given by Ilford in their data sheets. Kodak gives similar recommendations - in fact, the data sheet for T-Max Developer says:
Provide initial agitation of 5 to 7 inversion cycles in 5 seconds, i.e. extend your arm and vigorously twist your wrist 180 degrees as shown below. Then repeat this agitation procedure at 30-second intervals for the rest of the development time.
I'm surprised you are getting surge marks with that combination - I'd maybe try slightly less agitation, but you are following Ilford's instructions to the book. Might be worth firing an email to them and asking if they could suggest any reason why, their customer service is known for being very helpful.