I would add that , if you have a good archive of your bets, knowing your winnining percentage and odds average helps to know if the chosen % is below or above the 'recomended %' (you can calculate that with the Kelly Formula)
Totally agree here. There's a lot of different staking plans, some are better for lower hit rate but higher odds, some are better for higher hit rate, but lower odds. Also very important is your risk tolerance. For example with progressive staking plan - the first bet is 100 and lost, second is double of that and 200...loss... the third one should be 400 but you have already lost 300 and with this stake, 700.