I've been aiming for 1lb per week or 4lbs per month while gaining. Yes, you add some fat.

Fat loss is about a million times easier than muscle gain so think long term

Also, here's my N=1 anecdotal evidence. Smolov squats 4x a week for 3 weeks. Dropped the heavy upper body stuff basically.
3 weeks later at about 2kg heavier I upped nuetral grip chins from 9,8,8 to 10,10,9. No idea on growth but 3 weeks is not going to make you're arms explode no matter how much you eat!

You never really explained what you are doing on you're upper body days either?

How have you varied rep/set schemes in the past? People respond differently. Some like low volume/frequency while others are the opposite. Mix it up and see what works best for you.

Still unhappy with arms Guess its because I'm naturally skinny. Wish there was a miracle grow I could pump into my arms lol.

Well awesome genetics help for arms lol. Not everything is about arms really man. Just keep working your body and fueling it properly. Reach your genetic potential. Symmetry makes a great body and not arms. A nice back, nice legs, nice shoulders etc.

you seem to suggest that you arent overtraining your arms so maybe you arent giving them what they need. drop the weight and go really slow , so id 2 secs up 4 secs down. try angle prone db curls to isolate the bicep and stop any swing which will use other muscles to aid the movement. lie frontward on a 45% angle bench and again use a really slow tempo.

I say focus more on quality reps (slow negatives,maybe a pause,ect) I recommend reverse curls, barbell curls, tricep pushdowns, close grip bench, skullcrushers. Shoot for 3-5 sets of 8-10 reps.

I say focus more on quality reps (slow negatives,maybe a pause,ect) I recommend reverse curls, barbell curls, tricep pushdowns, close grip bench, skullcrushers. Shoot for 3-5 sets of 8-10 reps.

Amen, I use a lot of supersets with heavy weight. Then I use lighter weight.

Rule of thumb if the guy curls more than you squat, leave him alone if hes hogging the squat rack. Sorry, I had to. But if his arms are bigger than his legs tell him hes using the squat rack the wrong way.

It is a slow process, its not a major muscle. It takes years to build big arms, I wouldn't focus on it too much it will come naturally with lifting. It took me 12 years to get to 20.5 arms and it took working tri's and bi's at every angle. The message here is don't neglect one body part just because you want big arms, example working on upper body so much you neglect lower. ZeroWoIf had a good pic one time of a dude with stick legs and a huge upper body. Friends don't let friends neglect leg day,lol. After a 12 year layoff from lifting I'm taking it slow and am satisfied with my progress. I work arms once a week, over training will cause more cutting and will not make size gains. Bulking in the winter to be able to do heavier and low reps builds size. Do you flex when you lift or do you just go through the motions? If you flex with lighter weight and get the pump that will help too. JMHO

I've been training intense for the last 3 years and am looking to compete in the next couple of years depending on how my development goes.

Every bodybuilder uses the same exercises over and over why???? Because it works! It's ok to hit the muscle twice a week if your body allows this but otherwise, take some time out of the gym to grow! You grow when resting not when lifting!

As for bulking and food, you don't have to gain allot of fat if your diet and training are in place properly. For example when bulking i still do cardio, when i crank down i still do cardio but for a slightly longer period.

Here's my training:

Monday - Chest & Biceps (I find my biceps are stimulated better!)
Tuesday - Leg's & Ab's
Wednesday - Rest, but still do my low intensity cardio!
Thursday - Back
Friday - Shoulders & Triceps & Ab's

Here you can see, I'm indirectly hitting my arms twice a week! But with a good rest period in between.

Train smart eat well and you're get results.

Good Luck bro!