Round up power pro max, follow the mixing instructions carefully for what you are doing and you should be fine. I'd bid it for total redo if I was you those bushes don't root to deep and you can save time and make more $ by buying discount shrubs, perinials, ect to put back in mulch is cheap you'll stay in their budget and be a hero. It looks nice but feel like you maybe worked to hard fixing that overgrown wax bush.