The Carrots and Beets and Sweet potatoes should not be fibrous as you are saying they are !
"IF" they are like this, then they may have too much Potassium in them and may have Potassium Nitrate, which is not good for you !
Potassium Nitrate will "STOP" your Blood from carrying "Oxygen" !
How long can you live without Oxygen ?
You may want to find some better vegetables ?
These may be Poor Quality vegetables !
I have a champion juicer and it has juiced many things in it's life and has not had any parts replaced yet !
I have no problem with it juicing
these kinds of Good Quality foods, as mine are "NOT" fibrous !
Too much Potassium and not enough Calcium and Phosphate may allow these vegetables to become too Fibrous !
Smile Tis your choice.