Ok, thanks for clarifying your reasoning.
Alright, you're concerned that your arms aren't getting enough recovery and that you are therefore overtraining them. Assuming your nutrition is in order (which if it's not would definitely be the first thing to address), there are some pretty simple adjustments to your split that you could make without having to go to the extreme of completely throwing it out the window and replacing it with a 3 days a week Full Body routine. In other words, "don't throw the baby out with the bath water."
Also, considering that you are concerned with not getting enough recovery and your arms lagging behind, a Full Body routine like Waterbury advocates would be about the worst choice you could make as it pretty much mandates that you are working your muscles multiple times a week; so it certainly isn't going to give you better recovery.
Why not just switch up your split to allow for more recovery between workouts? Something like:
Mon- Chest and Triceps
Tuesday- Back and Biceps
Wednesday- Calves, Forearms, and Abs/Core
Friday- Quads, Hams, and Glutes
Mon- Chest and Back
Tues- Calves, Forearms, and Abs/Core
Fri- Biceps and Triceps
Mon- Chest and Shoulders
Wed- Calves, Forearms, and Abs/Core
All of those options would mean less frequency and thus more recovery for your arms (the first option being the best in that regard) and still allow you to hit all of your muscle groups directly and from multiple angles.
There is of course also the question of exercise selection, set/rep schemes, and mind/muscle connection (neuromuscular control/recruitment).