Reducing bodyfat will reveal vascularity and striations to give the illusion of big guns.
Christian as your friend I have to tell you that this and genetics are your biggest issue. You carry 20%+ bodyfat, in comparison to the rest of you your arms will never seem huge.
Apart from that I think that if you really want to bring them up you need to bench and press more than you are now - think about it, the prime mover of the arms are the triceps and the triceps make up 2/3rds of your arm musculature. A 220kg bench press with 14" arms simply isn't going to happen.
I know people here say you need arm work but really you've thrown everything and the kitchen sink at them. If it were true they would have exploded by now, not to mention most exercises you can do for your triceps besides dips and presses are an awesome way to get tendinitis.
I think you need to get back to basics with your program and maybe introduce a day or two of kettlebell work for conditioning.
Also i think your diet/celltech cycle has issues. I know you're not on the real heavy stuff for a while and you also need to make sure you get 2g of protein per pound of BW (steroids = > protein synthases).
tl;dr
1) Get your bodyfat around 8-10%
2) Bring your bench/press up as high as possible
3) Start a heavier cycle and make sure your diet is feeding it