When doing length stretching downward will adjust the angle of you erection but not the curve, as far as i know jelqing against the curve and what you have been doing with the [words=http://www.mattersofsize.com/forum/penis-enlargement-forum/12539-slow-squash-jelq-nothing-give-me-better-expansion.html]
SSJ[/words] and possibly the [words=https://shop.mattersofsize.com/products/sizegenetics-penis-extender]
SG[/words] is the only way known currently to adjust the curve but those methods may take years to make minor changes to it. It being completely straight may be your personal preference but if you do all that you can to change it and get minor results you may have to choose to accept it, imo a curve gives it personality and your already making it bigger, no one that experiences it will forget it because its not the same as others.