Private Pilot reported taxing too fast resulted in loss of aircraft control and hitting a taxiway light.

Narrative

I was taxing the 1946 Aeronca Champ (tailwheel) to the end of Runway XX at ZZZ. The wind was between 60 and 70 degrees and 8-10 knots. This would be a quartering tailwind for the taxiway. I had the appropriate control inputs in place. I realized I was taxiing faster than I should have due to the taxiway sloping downhill just prior to the turn to the runway. I attempted to break but with the heel style brakes I believe I had too much pressure on the brakes and not enough rudder input and began to veer to the right. When I realized this I put full left brake and rudder but it did not stop the airplane from going off the taxiway and hitting a taxi light. Miraculously there was no prop strike and no damage to the airplane at all. I called the airport and spoke to the ramp person in charge at the time and explained the situation and they said they would go out and take a look at it. I asked if there was any further action required from me and he said no there would not be. I believe the way to prevent a similar event in the future would be to taxi at a slower pace; paying more attention to the grade of the taxiway and focus on maintaining rudder input while braking.