Did you read
this first?
So it says check the gaskets and the No. 3 cylinder head bolts. Thats for the oil ontop of the plugs. Also torque is very important on the 7M, if somone over torqued anything on the head most important the valve covers which are very fragile, they could warp and not get a good seal on the gasket so that could be possible too.
As for blow by causing it, I doubt it. That would have to be a hell of alot of oil blow by. You would never have to change your oil again, your car would simply do it for you every 4 days. I bet (guess) it might be the opposite. The pooling oil in the galley may be leaking down into the combustion chamber, which puts me back at torque while im talking about it. The plugs need a certain torque also.
Ive only done a compression test on normal temp so I dont know the numbers cold. Before hand take the oil cap off and smell it. If it smells like gas you may have shot rings. Another thing if your plugs are fouled on the bottom it might be other things too. Have you used any Carb/throttle body cleaner lately or used too much fuel additive for too little gas in the tank?
Anywho just some ideas im no pro, But if your plugs are fouled and you have oil in the galley its prolly fouled the wires too. You need to replace both plugs and wires to be certain you dont get mis-firing thats bad, anti-seize on the plug threads and a little di-electric grease on the contact points is good.