You might as well keep the same team.

The whole point of them changing this system is because they want a 50% win ratio once you reach your max HR. So you are really doing yourself a disservice by starting over. Those teams that have a high win ratio like 45-9 means they played before these changes and have not played since. So even if you started over and went 30-0 up to your current 1940 HR, You would then be harshly penalized for losses and gaining 0-4 wins and 20+ losses since you cant win them all. Until eventually you had a 50-60% win rate.

I guess if you just wanted to get to 2k to get a nice win ratio if you just planned on stopping there, but over time when you reach you max HR it evens out.