0 360 Fp Prop
I had an RV 6 a with 0-320 Lyc and a Sensenich coarse pitch ,wood prop.
My climbs sound very similar, but # 1 & 2, very easily went above 400 deg F after lift off and climb at 90kts. My fuel flow was ok and baffles were ok, so as others have suggested ,I lowered the nose to 120 kts and found temps improved with altitude.
I had the plane for 8 years and it was ok. As I needed better climb on my short strip, I built RV7a 180 hp and constant speed prop. This is safer for me, especially when hot weather and full load.