[Titanaircraft] Jabiru cooling

I have been fighting low compression in the rear two cylinders of my Jab 2200 ever since Ive been flying my Titan. Im assuming the problem is due to inadequate cooling of the rear cylinders. The cylinders are covered with the standard (I think) plenum, there is no BRS, and Im flying in MN. Im wondering if Jabiru has more than one plenum design for pusher configurations? Maybe there is just poor air flow over the wing? Anyone else have this problem?

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