what you have now is good for going fast on flat.

but if you want to stop and skid easier and have a lower/easier gear for uphills, you want a lower gear.... so something like 46/17 or 18 or 19.....the higher the kog, the easier the gear (faster startup, easier for stopping/skids/uphill.... but not as high top speed)....also the lower the chainring, the easier the gear. but replacing cogs is way more cost efficient.