I think 6' 177 lbs is pretty scrawny and there is no way your diet and/or training is on point. If you aren't eating enough, no amount of AAS are going to help you put on muscle. It will make you more anabolic, but it can't make protein out of thin air.
But, if you are dead set on doing this, do it this way:
1-12 500mg Test
1-12 .25mg EOD Arimidex, adjusting as needed for itchy nipples/bloat and tapering off before starting PCT
15-16 40mg Nolvadex
17-18 20mg Nolvadex
Arimidex is not used for PCT, and SERMs are not used on cycle. And I have no idea why you think tapering off for 2 weeks is a good plan.