Only time I run out of power is when going up a hill in 11 or 12 gear with the backhoe on.
Only other issue is that if you have an early tractor, there is a defect where if you use the backhoe with the tractor pointing downhill for extended amount of time the drive gear to the hydraulic pump will run dry and seize up. The fix is a holder kit that has a new pump holder drilled with a lube delivery hole and a new oil filter base with a metered hole in it with a hard line connecting the two and it delivers oil to the drive gear. Never had a problem but put kit on anyway,
David