If you have an old pole you could attach 40mm or 50mm anti kink pond hose which is a flexible hose which you could adapt and tape to the vac , i am going to attach a piece off bent copper to the end of pole to get the ideal angle to reach into the gutter , my mate has pipe bender which will do the the trick
all in the hope of eliminating afore mentioned blockages food for thought i hope chaps , mike