Pretty much what i do. Caesar was easily eating 2XL guinea pigs but within about the same time period as a XL guinea pig, the lumps were gone. I have dropped Caesar down to jumbo rats or XL guinea pigs and just moved it up to every 7-10 days. Smaller meals on a little faster time frame. So far its been 4 days on the XL guinea pig and Caesar is quiet and just chilling in his cool hide.
Is that a jumbo RB hide? If so, Phyllis is HUGE. Caesar still packs himself into half a jumbo hide lol.