Short Straddle Intraday

I have been virtually trading Straddles since a while now,

What I do :
9:30 ATM calls and puts are sold around 2:30 will start monitoring my position again and will square off anytime post 2:30 Virtually this has not shown any major loss majorly has a positive outcome at the end of day.

I have read how theta decay works in this and have knowledge of it also second is that adjustment will only be required when the spot price crosses the sum of the complete premium recieved

Ques here is is it actually so successful as 70 to 80 % of the times market is range bound
if someone has actively done this and could share experiences would be of great help

Thank you