Not surprising. 205w to 230w is a 9% increase. That is unlikely to happen for all but the newest riders or ones starting back that will see a quick rebound.
It is much safer to plan on a 2-3% increase and do a workout or two to see how it goes. That increase is a reasonable and common one in many plans for many people over a 4-6 week period.
Resist the urge to overestimate the FTP as it will do more harm than underestimating.