Money management is important, but it isn't a holy grail. I would never tell someone MM is 80% of the game, let alone even 50%. MM mistakes can kill you, but there are thousands of guys out there that play well within a good MM plan and still don't win long term. You can't lean on it too much is the bottom line.
All that being said you sound to be on about the right track. Keep bets to 1-2% if you really value the bankroll, in other words you couldn't replace anytime soon if it got wiped out or seriously depleted. If you are playing with more of a disposable income approach to a bankroll then you can start out 3-4% a play. As you win and it gets bigger, you should work to slowly bring that down to the 2% mark, which is what I would suggest for anyone not counting on the money from sports betting. If you are counting on it for some level of income then 1-1.5% is more appropriate for safety and peace of mind. As for the adjustment, just be careful to add one piece into that equation, a sustainability figure. If you are up 25% because you bet 3% a game and win 9 in a row, you are obviously asking for trouble. Assume you can win a max of 10% of the volume you bet and keep track of that number adding it up each day depending on the volume of bets. If your "potential" win is as much or more as your actual win, then go ahead and make that adjustment. A very crucial key that few seem to grasp. Sports betting is extremely streaky as we all know, but the gravest mistake made by many is to not keep this concept foremost in your analysis of your abilities and bet sizes.