Greek, I too have both kinds of erections. The narrow hard and curved type and the fleshy, wide and more straight kind. Absolutely fascinating to hear what I experience described so aptly.
When I make my temporary recoveries it returns to it’s pre-PFS morphology. This is interesting. It’s almost as though certain nerves are activating which allow differing levels of blood to fill different areas of the penis.
If we describe the two states as as ‘thin’ and ‘wide’ respectively, it’s almost as though the penis structure is allowing more of itself to fill with blood in the ‘wide’ state. This straightens out the penis, as it provides structure around the periphery of the urethra (or so I hypothesise).
When the penis doesn’t have these supporting blood vessels,namely in the ‘thin’ state, it curves upwards due to the lack of reinforcement. It’s hard around the inner core but the outer core is almost as though it’s a balloon which hasn’t been inflated.