@rkndvm Welcome to Mayo Connect. I see you are a fairly new member here, and I might have missed greeting you.
Like you, I have kidney issues, and proteinuria caused by a rare disease. There are other health issues, also, and I received my vaccine as early as I could as I was due to start chemotherapy. At age 67, I was given the "older folk" vaccine. I made sure the pharmacist who dosed me, knew of my health issues. He was very informed and assured me it would be fine to receive that version. No aftereffects, which is great!
How has your proteinuria been in the year since your last flu vaccine/Pneumonia shot? Has it remained high or decreased back to more normal range? It may have been a coincidental with stopping the prednisone. I'll be interested in hearing back from you!