Maybe there is a reason your doing this way .I can’t see it .I have installed ductil pipe for 20 years ,I would go broke doing it this way.try it the right way and use the backhoe to push it home.
May I ask how did you check or which tool did you use to check angle of slope made by bend ? In simple words, how did you check D.I 45 degree Horizontal bend which is rotated to 32.5 degree angle downward after installation ?