Dungeons with ultimates

Hi guys. I´m 136lv with a full tier of ultimates. I only find 100, 150 and 200 lv dungeons. At 150-200 can´t make the 4%  with my ultimates anyway. I think i could get it at lv 100 dungeon but it dies too fast.
Should I spend my jewels in a god or it won´t change anything?
Do I forget them and keep hitting normal bosses?

Thank you (and sorry for my english )

You won't be able to even get a B rank with only ultimates on lv100

Just forget Dungeon and focus on leveling.

I have Dark/Air/Fire Gods and rest Ultimate team for Dungeon.
It takes 30 attacks to get 1% on Level 100 Dungeon.

Even a full team of Gods will be nowhere near good enough to farm Level 100 Dungeon.

Thank you. I think i won't try a dungeon for a long long time