Some of my best cycles have been on 500mg of test a week. I think you ll be able to make some solid gains on 400mg a week. Especially if you re planning on running it for 10 to 12 weeks. After the 2nd or 3rd week, you ll be rocking and rolling. Throw a solid oral for the first few weeks and I think you ll manage 15 pounds no problem, since this is your first cycle in 2 years.