while playing with onepack's spreadsheet I figured out that the best way for the dosages i selected blood hormone levels to stay flat is..
day 1 500 test enanth 75 mg tren
day 2 same
days 2+x 63,5mg test enanth ED + 32,5mg tren ED
in 2 days you go to top levels and from day 2 blood levels are completely flat.