Now correct me if I guess this wrong, but I think the most important thing is that you
start doing the stretching and - don't stop until a month after you achieve whatever you determine to be your goal.
Good illustrative set of pictures there.

Clearly you have a tightness of the circumference of your foreskin, and you also have some tightness of the frænulum.
It would seem that the "frænuloplasty" has not been entirely helpful, and I am inclined to suggest that since such a procedure results in scarring, you are probably no better off for it as you now have to stretch a scar rather than stretch the original, which might have taken no longer overall.
But the point is - that is basically what you want to do. I have written comments on how often, how hard and how long
so often here that I really don't fancy repeating them - just have a good read through the threads and you will find it all. It's worthwhile just seeing what others have experienced anyway.
The summary is - you do the stretching with fingers in the foreskin (flaccid) because the pressure of the erection simply is not sufficient to achieve what you want in any plausible time frame, and while stretching the frænulum by the technique we so commonly illustrate may or may not be strictly necessary, it will probably benefit you.
Actually, the matter of the tight frænulum "bowing" the glans is, now I come to think of it, an interesting one. What I have proposed in the past, is that it should not
matter if the glans can be "bowed" in this manner, as doing so implies a quite unnatural degree of tension pulling the foreskin back which would only happen during intercourse if there is a gross lack of lubrication and perhaps also, excessive vaginal tightness.
In general, I think that is an accurate summary. I begin to wonder however, whether there is a further
teleological basis to the existence of the frænulum. It occurs to me that such discomfort as you may suffer from the frænulum being pulled so hard as to "bend" the glans, may actually be of advantage in
telling you that something is wrong (and that you are no doubt, causing corresponding injury to the lady); that it may be a
good thing to be so reminded to "take it easy".
In any case, I think it is up to you to
start the stretching, and see how effective it is, and perhaps then to describe what you have found as a basis for further discussion.
And there is certainly nothing at all wrong with masturbating with your foreskin over your glans - that's pretty much what circumcised men attempt to emulate in most cases - the alternate approach of using copious quantities of more or less effective lubricant, is far less practical by comparison.
