Interesting Mr Buzz. I did exactly the same a few years ago and for a while became something of a convert to the church of Sir Edwards.
Found exactly the same as you - back to the PTNs and HEs I went, cap in hand, tail between the legs......and all the better for it. That Jeremy Lucas chap has it about right I reckon - the slim, dense profile of a wee bead headed PTN allows it to sink rapidly into the feeding zone, thus making it essentially, a
tactical fly
But seriously, the semi realistic OE heptas and baetids are absorbing to tie, satisfying to have in the box......but frankly not worth the hassle. The only times they have ever pulled me out of the sh*t are a couple of occasions when I sight fished to large trout holding stationary in shallow slow flowing water. They worked a treat then when maybe the standard patterns wouldn't have passed such leisurely scrutiny.....dunno. Also, the baetis nymphs work well fished shallow on early season, pre-rising LDO feeders - they get maybe a couple of outings each season.
Not a bad exercise in improving your general tying techniques though.
M