Sorry, proportional is the only fair mining method. A share is a share, no matter when it is submitted.
Why do you pay them differently then?
Paid differently? Not sure i follow, every share is worth the same. The other payout methods pay people differently....
No, if every share would be worth the same, you'd have PPS.
You pay a different amount for each share - and some people choose to only mine when you pay more. You obviously don't like that and/or can't handle it (other pools have FAR higher hash rate than 10x all the hoppers together). That's your issue.
By the way, with a scored system you'd still pay every share...