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Different filters may have different resistance for the oil flow, depending on the pore size. Normally this should not make any difference to a properly functioning engine. Probably you have a leak somewhere in the system. This can be a lot of things, like a broken o-ring at the pick up tube, damaged oil pump rotors or something at the relief valve, etc. I would think the oil pump can`t keep up with the increased resistance given by the better filter. With the engine warming up it gets easier for the pump to push the oil through the filter material, hence the oil lamp flickering stops. I would drop the sump and start inspecting things around there.
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