Great to see that you're saving it for marriage!
Heavy downward stretches are really simple: it's just one part of basic stretching that you can easily find in the [words=http://www.mattersofsize.com/forum/penis-enlargement-newbie-forum/1597-dlds-first-routine-i-gained-2-inches-with-this-routine-full-tutorial.html]newbie routine[/words]. You grip the head of the penis--about one inch down from it--and stretch in all directions. Stretch from left, right, and right out while stretching straight up, straight out, straight down, and behind the cheek. Stretching straight down and
BTC gives you base girth gains as it pulls the ligaments, revealing thicker inner penis. And it is very good that you have the [words=https://shop.mattersofsize.com/products/sizegenetics-penis-extender]
SG[/words] [words=https://shop.mattersofsize.com/products/sizegenetics-penis-extender]extender[/words]; I envy you! After your workouts, you can keep your [words=https://shop.mattersofsize.com/products/sizegenetics-penis-extender]
SG[/words] on so you can keep it in an extended position and let it heal in that extended position rather than risk your penis turtling; you will also condition the penis to hang lower and fatter as a result of the constant extension. For more information on that, I suggest you read DLD's [words=http://www.mattersofsize.com/forum/showthread.php?64036-My-Best-Work-Ever-Penis-Enlargement-will-Be-Changed-Forever-gt-gt-Gain%20inches%20with%20SRT-Theory-and-Routine]
SRT[/words] theory and you will see exactly what I mean.
As for as making the girth all around even, I am sure it is possible, but most guys I've seen with uneven girth(this goes for cone shaped dicks and baseball dicks) usually just go with the flow. I think you would have to do very specific exercises to make your cock truly even. You're in a very good position as far as goals go; basic stretching and constant usage of your [words=https://shop.mattersofsize.com/products/sizegenetics-penis-extender]
SG[/words] will work well. I would also try to seek advice from someone who owns a [words=https://shop.mattersofsize.com/products/sizegenetics-penis-extender]
SG[/words], too. ;P