Picture 1 is the front. Could be the Presonus pre. Crappy tube? Bad interface connection with D8B? Who knows. Try plugging it in directly to the D8B and see if the sound improves. Don't forget to turn on 48v in the back of the board.
Try this before you stick the 1073 in between. Then try the 1073 and see if things improve or not.
Next time out, kneel in front of the amp from about 3 feet out. Close your eyes (I'm not kidding) stick your hand out in front of you (move around a bit) and position your head and hand to align with an imaginary straight line between your head and the best sound you hear. You hand will be where you place the mic.
Melodyne, huh? Have it...use it sparingly.
In the case of vocals, you should keep making alternate takes until you get good solid (and in pitch) performances and then comp 'em before ever going near Melodyne. If you're having pitch problems (as opposed to timing issues...which is something better fixed with Logic's Flex) lower your phone volume a bit and position one headphone can behind your ear, so you can hear yourself in the room. It is a known fact that listening fairly loud in both cans while recording has a tendency to fool singers into thinking they are singing flat...and so the general performance winds up slightly sharp. It's visa versa for phone volume set too low.