Fausto,
I agree with others about your bodyfat% being closer to 12%. Then again, as long as you measure it consistently, you'll be able to keep track of your results.
As far as iso's go, I stopped doing them a year ago after my 2nd Faustonian cycle (remember that?) Since then, my arms have grown quicker than ever before. Chins, Dips, Bench, Deads, Rows, and Shoulder Presses all hit your bi's, tri's, and forearms.
-Colby