RE: arms the lagging body part
I'm like 5'10 around 172lbs... Arms are 13.5 and 13.... straight out unflexed. Is that the way you guys are measuring or are you giving your flexed measurements? Makes me feel small heh... And my arms seem like they are in proportion.
Now on topic, I agree. Why are you worrying about size after 8 weeks? Train 2 full cycles, 12 weeks each with a 1 week break in between on 5x5 and then take your measurements after. If your diet was good, you WILL gain good mass. In my first 3 months I was quite satisfied. And now I'm on my second 3 month cycle. It's good... Simple... And it works great for both mass and strength, what more could you ask for?