It was more a matter of continued experimentation. While on only enanthate I felt there was room for improvement and wanted to see what propionate would be like. When I saw the large variations in serum testosterone with daily propionate I started thinking about how to damp them down to more natural amplitudes. This is how I eventually arrived at the blend. Although there's utility in getting some numbers with single esters first, it's still possible to tune with a blend. You must either try to get peak and trough measurements or else make assumptions about your rate of absorption.@Cataceous, as you know, I am interested in following your logic. I am currently not on either ester. I was planning on starting both esters simultaneously. As I read your post above, however, it sounds like you did this one ester at a time until you started the blend. Was this by design or were you in a trial and error and eventually ended up with the blend?