435 grs of protein will also explain the high BUN.
You dont need that much protein. Your kidneys are not managing to remove all this urea (protein waste)from your blood. Lower your protein so your kidneys suffer less stress.
Look on youtube for george farah speechs, I tend to agree with most he says about nutrition, he only has 1 kidney due to a gunshot wound.
Personnaly also agree on reduce fat and increase carbs.