Why? Jim's pretty much got it covered! (Jim's a big AXhole and knows his stuff...)
I'd agree with most everything so far here, but want to make a few suggestions to consider as well.
Yes, you could run it 6/day for 6 weeks. At your weight, you're borderline between 4 and 6 as your daily dose. With the doses/bottle ratio, at 6/day, 2 bottles will last you only 30 days. You'd need a third one to make up that other 15 days. For PCT, since this is a rather extended cycle, I would recommend going for longer as well. 2 bottles of PCT ran for 60 days would be the best recommendation. You don't need anything stronger, just more time. This is a great deal of time and money, and a good reason why the 6/day recommendation is for 30 days instead of 6 weeks. At 30 days, you'd do good with 1 bottle of aPCT for 30 days. It's simpler, cheaper, and more than good enough to get out of it what you want.
MassFX is not a simple "test booster", but rather works to increase free test - something that is highly usable while on this cycle. You can incorporate it into the 3-AD part itself, into PCT, or even both.
Hepatoxicity? Not really. While 3-AD is quite safe, running higher doses for extended periods of time beyond our normal recommendations isn't advisable as side effects may start to crop up. You still won't need any liver protection or additional PCT, but it's worth noting that overdoing anything is a risk.
Need anything else, just ask! :cheers: