I prefer the 1+9 dilution of Ilford Rapid Fixer for prints. Handling larger prints and trying to keep the fixing time in two baths plus drain time to under 60 seconds is just too hectic. For RC prints, which don't have the washing problems of fiber-base papers, there's no reason not to use a longer fixing time and a weaker dilution. Since the capacity for both the 1+4 and 1+9 dilutions are the same, it is actually more economical to use the weaker dilution. If you are processing for optimum permanence, do use two fixing baths.
I'm surprised more people don't test for fixing and washing. I use a drop of selenium to verify proper fixing, and for 11x14 and up, I try to minimize time in the fix - fix for :60, quick rinse, test - if I get a yellow spot, back in and I can usually judge the time by the darkness of the spot - maybe another :15, quick rinse, test again til clean.
I test for washing with RHT, similar process... wash til I feel I'm close, test, wash some more if needed. I feel this has saved me a lot of water over the years.
I think he thought of TF-5. Both Liquidol and TF-5 are to a large extent Ron Mowrey's brain children.
I think at some point developers got mentioned above? Then again, I think I had a head injury so severe that I don't remember getting it. My wife would agree. (But damn, Liquidol is the stuff.)