I've never used this tool. Use the "rope method" to tighten/loosen crank pulley bolt. A slipping harmonic balancer will not affect the timing. The crank timing sprocket and cam sprocket sets the timing. The marks on the crank will be off but not the timing. Process is remove crank pulley. Compress the tensioner and slip a drill bit/nail in the hole. Lower sprocket timing mark up, on the compression stroke. Route the belt counterclockwise. Lower sprocket, intermm, cam, slipped into the tensioner, remove the bit/nail. Are you sure you have the "nub" aligned on the crank pulley? I ignore any marks on the timing belt itself.

"Tension timing belt: Keep the right side of the belt under tension and the tensioner side initially slack. Then release the belt tensioner by loosening the nut or pulling out the nail. (If the left side of the belt is tensioned and the right loose when you release the tensioner, the pulleys will move and ruin the alignment). Tap the tensioner flange with a hammer to ensure it is seated in its mounting holes. Loosely install the tensioner nut."

https://www.brickboard.com/FAQ/700-900/EngineSealsBeltsVent.htm#Changing_Timing_Belt_Procedures_for_B23_B230_Series_Engines
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