I'd say you're on the money for what a VF34 can produce. 16HP is fuck all and will not be noticeable.

When Justin first tuned my car the Dyno read 643whp, when we did it a second time some months later it read 605whp yet the car was a fuck load quicker after the second tuning session.

Moral of the story don't get tied up with figures. If you're happy with how the car drives then just enjoy it. At the end of the day a dyno is just a tuning tool. I pay no attention to figures. Dyno talk is for bragging rights in the pub.
For me its times on the strip that counts. That's where you should find out if your cars improving or not.

The tarmac never lies!

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605whp
Quarter Mile in 10.9 seconds @ 135mph /217kph
0-100 kph 3.2 seconds