Just for the benefit of others trying to diagnose the issue, the "brake/engine rev" test isn't terribly useful for a couple of reasons. First, the ECU is unhappy when you try to rev the engine in gear with the brake on, it tries to cut power input.

Second, the mounts are hydraulically-filled, not rubber. They don't "tear away" like rubber mounts do. When the oil leaks out, they sag and transfer the engine vibration to the frame more readily; the engine isn't flopping around as with broken rubber mounts.

Hope that helps.