I don’t know about MK677 really ive never tried it but I have run hgh and with hgh I believe that you will need to run much longer than the MK677.
I believe that the test and decca are definitely going to get you big its an amazing cycle just gotta watch estrogen I would recommend proviron or drostanolone definitely included it will really help with aromatase which there will be plenty of brother.
I would get some caber because it’s decca can’t really just drop it but I believe that P5P will help soon to be available from ugm supps .
I would also use adex or aromasin possibly exemestane for the e2 control.
I definitely wouldn’t start pct for about 6wks after decca and running 20wks you would probably be best cutting out the decca a couple of weeks before the end possibly tapering your testosterone down. Decca just lasts so long its crazy especially after 20wks I swore I was still making gains from decca 8wks out after last injection it was crazy and added alot of mass I finished the bulk above 260lb you can really pack it on especially when running that long brother.
Blood work is so important for long cycles especially. I found that the tests for just p2 and e2 are cheaper and its really all you need to monitor towards the end after full panel blood work at 6 and then p2 and e2 can be monitored as needed and not break the bank but still run safely.