Switching from high-bar to low-bar squat for T1 and T2, how to start again?

Probably a dumb question, but recently I had a session trying out low bar squat and it felt great. I was able to hit depth easily and overall just felt much much stronger coming out of the hole compared to high bar squats. I am considering switching since my goals are to just keep moving up in weight and high-bar squats at 185 lbs was becoming really grindy (haven't failed T1 yet, but feeling it coming soon).

Should I just lower the weight to something I find comfortable with and work back up or re-test for a 5 RM and begin from there again?