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Jake Raby says to avoid driving at a steady 3,000 rpm as that is the worst rpm for engine vibrations in these engines. Having said that, I find that 3,000 rpm in 6th gear is about where my car runs on highways to go with the flow of traffic so I do it all the time. Maybe your old dual mass flywheel was out of spec enough to mask issues that are starting in your motor mount and possibly also your transmission mounts. Or maybe some nuts and bolts weren’t fully torqued on reassembly? Even experts have occasional oversights on basic stuff, and putting it on a lift and taking a look is something I think they would do after you just paid for that big job.
I am not an expert in these matters by any means but these things may be worth checking out.
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