Not an answer to your issue, but compared to my O-320 150HP, your fuel flow numbers seem high, even for break-in. My cruise fuel-flow at 2000' would be closer to 7 GPM at 65% power, which would be ROP. Don't be afraid of the red knob even down low.
Keep in mind that EGT temps by themselves mean little, and sensor placement can cause some cylinders to read higher than others. And intake leak or ignition problems are certainly possible and worth checking into.
Regarding CHT's, in a carb'ed engine especially, the uneven fuel, air, and cooling in a carb'ed engine means some cylinders will always be slightly hotter than others in different flight regimes. You will find that you can cool the front and heat the rear cylinders by going WOT which tends to result in richer mixtures in the front cylinders, and vice versa. Airflow on different sides (maybe from propeller slipstream?) also affects cooling - it looks like in climb your left cylinders (2 and 4) get much less cooling airflow than 1 and 3. On the plus side, you don't have the hot #3 cylinder that many people struggle with. Your cruise CHT's look pretty normal to me, and will probably come down with break-in. Mine run 340's in the warmer months and were 320's yesterday on a flight from FL to NC. at 13,500.
You don't need to worry about leaning down low - as long you get under 60-65% power you can't hurt it with leaning, and you can monitor temperatures and take action well before anything gets too hot, should that be an issue.
Chris