The resistance of a glow plug is dependent on temperature. Does the manual state at what temperature that spec is for? When did you measure resistance, engine hot/warm, temp outside? The hotter it is (ambient or engine temp) the more resistance it will have. Since all plugs measure 2.2ohms I doubt the plugs are the problem.
Understanding how a glow plug is made and works, 1.5 and 2.2 ohms is not a significant difference. Incidentally you can also get a good idea on a cylinder that is weak or misfiring by measuring glow plug resistance on a warm running engine. The glow plug with a lower resistance is weak or misfiring cylinder.
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