You've been bulking with 3,800 calories at your weight since September with negligible fat gain?! You must have a raging metabolism if that's the case.
Have you considered doing your lower body exercises at the end of the workout? They usually fatigue people to the point where the following upper body exerices suffer, but seldom the other way around.
That upper-lower split looks fine, and it looks idential or similar to every other upper-lower split out there, like Lyle Mcdonald's Generic Bulking Routine, which is fine too.
You will likely not succeed with the four way split considering your stature and makeup, but that's just my opinion and others will likely disagree.
Here's what works for genetically ordinary people who will likely not compete, who want to just look good or "get jacked" or whatever! And again, some will disagree with me
1) Mostly compound lifts mostly with barbells
Chest: bench variation, dips
Back: Row variation, chinup/pullup variation
Legs: deadlift variation, squat variation
Shoulders: Overhead press variation
Throw in whatever isolation or arm exercises you must, but in the beginning, and maybe forever, this is all a genetically ordinary, non-competitive guy needs. Approval or disapproval or endless opinions doesn't change this, and if you look at the success rate of all-out splits for ordinary guys, non-competititve guys, it is very low. If you have great genetics like that guy KingBeef who used to post on here, who probably progressed very quickly and had some decent muscle mass to start with, that's different. Or in the case of someone who has been training for a long damn time!
Work these into an upper-lower split or full body routine or whatever split allows you to train each muscle at most once every five days. Anything less frequent is too slow.
Work in moderate rep ranges. Add weight and add reps when capable.
There's not much more to it in the beginning and if you look at the most popular programs for ordinary people, this is what they're about: DC, LM's GBR, Stronglifts, Starting Strength, Greyskull, Nunez's upper-lower, HST, Layne Nortons's PHAT, and so on. When you strip them down, they're all the same shit with different layouts.