I'd probably lose the amber DME, and instead steep .5 pound of crystal 40L for 20 minutes, and increase the light LME a pound. I'd probably move the 30 minute columbus hops to the beginning, for more bitterness if needed, or leave them out as I don't think they'll contribute much at 30 minutes.
I normally don't transfer before dryhopping but you can if you want. I'd dry hop for 5-7 days. I think your FG should get below 1.020, if you have a healthy fermentation.
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