You've checked all the usual suspects and I wouldn't get too concerned about a 5 psi drop in oil pressure, as the oil warms up. (for example, I run the engine for about that amount of time before changing the oil and that makes a huge difference in how much easier it is to pump the old oil out).
As I recall
, this is an indirect injection type engine. It looks like you have a case of excessive un-burned fuel, as it only comes from that one cylinder, so I would check the condition of the pre-cup and its' sealing surfaces. It could be that there is not much accumulation of oil, or fuel, because you have only run the engine for such a short time and fuel would tend not to accumulate as much as oil would. You should be able to remove the injector and then extract the pre-combustion chamber.
Let me know what you find.
Hope that helps.