I am not sure exactly what you are describing here, but I suspect it is pretty harmless. There is
no basis for the suggestion that for example the way your penis "bends" is indicative of the technique or "grip" you use to masturbate, and the fact that you are rapidly moving the foreskin back and forth - in whatever fashion - is much the opposite of the prolonged stretching we describe here which
is necessary to actually alter the skin, generally to effect retraction.
We would indeed be interested in a little more detail of your situation (including - your age?). Presumably you are not yet involved in intercourse, so in no desperate hurry to achieve retraction, but are even now proceeding with a stretching "program" along the lines we describe?
Men who are so unfortunate as to be circumcised, generally masturbate so as to pull whatever mobile skin they have,
forward over the glans, concentrating on this "forward stroke" and re-gripping as necessary to facilitate it. In your situation, one option would be to emulate this, pulling
more skin over your glans on the forward stroke so that on the "back" stroke, you come back to the point where there is just slight tension on the tight part. Have you not tried this? I am not suggesting you
must, but thought you would have done so.
{The
other way circumcised men masturbate is by using a lubricant which is rather inconvenient and messy in the main. If you have a non-retractable foreskin, this is also an option - I always point out that having a non-retractable foreskin is rather
similar to being circumcised, except that the limitation is relatively easily remedied whereas being circumcised leaves little hope of solution.}