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There is not a lot of thing that could affect compression on all cylinders at once. Throwing a rocker arm would only affect the cylinder that the rocker poped off, and it is very unlikely that you threw 4+ rocker arms at the same time.
Also, a cracked piston could affect compression on the cylinder that the piston is cracked... also very unlikely that you cracked all 4 pistons a the same time!!!
So I will leave to option here :
How far did you run with you IC coupling disconnected? Driving with a rich condition for too long could glazed the cylinder walls therefore causing low compression, and oil fouling on the plugs.
My other bet would be on the mechanical timing. Camshafts are a common points on all cylinders. If you retard or advance it (like skipping teeth) this could affect compression on all 4 cylinders. Also, you could have bent valves from this problem, which you will need to check if you timing is not correct.
I hope this help!
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