Given your strength, I would look at beginning with 90-92” or 51-50/15. Work on that gearing. You quite easily have the strength to push it and spend some time develping the fitness and power to push high speeds for longer periods. It is worth noting that despite the big gear trend, the proper fast big gear riders are also very fast on much smaller gears. Also do not underestimate the role of fitness. Even pure sprinting requires quite a high level of fitness at higher levels. It’s no good ripping out great F200 times if you can’t make it to the end of a sprint competition