You should really try finish CoP and ZM and get yourself Rajas ring and consider maybe getting a Bushinomimi ( 2 free STR on ear slot, and you can always repeat the mission and change the item ) and a Hollow earring ( 2 DEX and 3 acc for free, not to mention DEX affecting crit hit rate which also is RR's TP mod ).
Try get Byakko's haidate and ecatomb Leggings / Mittens while at it.
if you want to stick to RR then you can get yourself a free ( can't get cheaper than that ) Voyager sallet and a Jaeger ring off Carmine Dobsonfly NM, or ask for help getting Askar zucchetto from Nyzul isle Floor 100.
Once you finish ACP mission line you can leave those in your MH and go for a Champ. Gaela.
Once you finish CoP and get your Rajas ring you'll be able to get an easy 6 hit build on /SAM.
Until then you can eat carbonara food which gives 6 stp to backup for the lack of te ring. Get an ecphoria ring or attila earring and you're set for a cheap 2.2 tp build.
It's 3.10 am so I hope I didn't make any mistakes lol , just trying to stick to what you asked for. Night