This sounds alot like the saga I've been through with my 2.0 5 cylinder. Bought the car with an intermittant bad tappet. Did the cambelt/waterpump etc and new tappets and the problem is worse! If I wasn't replacing the engine, I'd be doing what's been said and having the sump off to see if there's any crap in the pickup.
If the V6s are anything like the I5s the oil pressure sender is in the block. Presumably the oil meets this sender way before it gets to the head. So the pressure you see at the head(s) could be considerably lower that what the gauge is measuring in the block.
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