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If the OP used just a long bolt going from added top plate through the bottom floor and bolted to the subframe bushing, then it is not good. There must be a long spacer tube around the bolt from the added top plate to the bottom floor. The spacer tube prevent the top and bottom floor pulled together when bolting the bushing. Without the spacer tube, eventually the two floors will be moved closer then there is backlash between bushing and floor, then hammering and destruction on the floors.

For the towers connecting rectangular beam method, again is there a spacer tube from the bolt mounting beam to the bottom floor to support the pulling force when tightening the long bolt?
 
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