I'd say go at it as is written and if you don't like the changes you see within the first few stages you can modify the last few stages. But I'd gander that while you have muscular arms, which is awesome btw (jealous), they probably only look "big" to you - to the rest of the world they probably looks awesomely strong.
I will say though, that i have put on a nice bit of muscle in the arms, and especially the shoulders (love it!!). But the changes i've witnessed have totally defied expectations. Everything is rounder, firmer, indeed more muscular, but also smaller and more compact!! Like a little starburst, as my friend so kindly put it.
All this to say, you should wait to make changes to the program until you see what it does for you in the first place.
Anyways, we're all different, so do what suits you! If you're afraid to get bigger arms, then back off on whatever you think will make you have bigger arms. But I think Lou et al. really got it right, these programs build muscle in a porportional way - its really quite fantastic!
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