Your camshaft is the problem with your combination. You can easily raise compression pressure significantly if you choose a dual pattern camshaft with very widely spaced intake and exhaust durations. something on the order of 10-12 degrees. What you have now is a four degree spread. what that will accomplish is opening the intake valve early and closing the exhaust valve late. This will result in filling the cylinder completely. The rest is up to you. A tight lobe center will result in a rougher idle and the power peak will be slightly higher in the power band, while a wider lobe center will result in the opposite. with the bottom end you have, "I" would recommend limiting your .050" duration to 240 degrees at the absolute max. Better would be 236. So, probably something like 222 intake and 236 exhaust would get you there. With a spread like that, you will fill the cylinder much more completely than you are now and the cylinder pressure will increase resulting in more power with the same bottom end. Go shop through the cams on the Hughes Engines site and look at all their specs. They have wide duration spreads just for that same purpose. Because they work.