I also had major problems after updating to 4.5. I was finally able to get it right by adjusting both retraction distance and retraction prime amount. It took me a while to realize that if you change one you also have to change the other. I made a small, fast printing test for it. but your part looks more like under extrusion, either your extrusion is to low or the z offset has moved. I would run a bed level test first then run the tower test I made. its only a 15-minute print and it worked well for me to get my walls smooth and no stringing. with the bed leveling print you can adjust your z offset as its printing to get the best results.
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