I did the same (cut off the corner). It definitely made noise going down even a not so great paved road.I found a thread where @Sudo noticed that his Savvy motor mount lift block was contacting one of the bolts that goes into the engine block. Sure enough, mine is also contacting the bolt on the passenger side.
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I’m going to take the lift block out and cut the corner off. Here’s hoping that’s my noise. Even if it’s not, it can’t be good having those parts rubbing.