RAT5 if you want a good outcome just follow the QRH and company SOPs, its that simple. Don't you think Mr Boeing has already thought of that?
If you want RAT, after the memory items are completed, change the TCAS to TA only. The QRH does give the caveat of "The PIC can do any checklist off by memory if he feels that it will not jeopardise safety in doing so..."