I'm with Tristian, I have pretty much stopped doing it now at all, unless it is a big money event, otherwise I just plough on without hand for hand - it has worked the last two weekends with a £10,000 and £7,000 event paying 20 and 15 respectively, without issue of who went out where.
If you do have any issue with who placed which position, and cannot seperate them by time, then you can still combine both prizes and split between the two players.
Regards
Stuart