Front vs Rear EGTs

Recently had #2 cylinder get hot and freeze the rings and lose compression on a Zipper big bore on a 912ULS. Suspect ran lean from a brittle / bad o-ring as there was blue, fuel stains on the intake before the cylinder. After this I decided to add EGTs to the front cylinders to my Dynon (only had rear before). However there is what appear to be an excessive spread between the front to back, between 140-170F at 5,500 RPM and 180-200F at 5,800 RPM at WOT with a CS prop on the ground. Is this normal? What’s weird is the front are higher even though they are about an inch further from the exhaust flange (best I could do with the bends on the Just Aircraft exhaust).

5500

#1 1503

#2 1447

#3 1360

#4 1276

5800

#1 1541

#2 1480

#3 1360

#4 1284