HE vs Omaha Hi winrate comparisons?

[CEE]

I've been a successful micro limit HE player on Party, winning at about 5.5BB/100 over my first 10K hands at .5/1. Have moved up to 2/4 recently, and things are going fine there...

Recently, I've joined a friend at the Omaha High .5/1 table on a few occasions, and... it seemed incredibly fishy. almost everyone at the table was playing 70%+ of hands, no PFR (other than me), and seemingly terrible post flop play.

Anyone out here have significant number of hands at low limit Omaha Hi? What's your delta between Omaha Hi and HE win rates?

Side note... I'm not a pro or semi-pro... do this for fun and learning. As such, I only single-table, and do use PT and PAHud. Also, any thoughts on the value of PT Omaha for Omaha Hi play?

Thanks for any thoughts.