T-max 560 lose in power after enlarged throttle body

Hey guys!
I have a Tmax 560. Model 2020

Mods:

• Variator Polini evo 12/14gr.
• Turque spring polini 94kg.
• Variator belt Polini 31.2mm, with shim installed.
• Bmc air filter.
• Marvin lab 38mm velocity stacks.
• Akrapovic exhaust.

I recently installed the enlarged throttle body 37mm of Jetprime. And I followed the manual perfectly.
Everything is working pretty great.
But when I tested on the dyno. I got a power lose. 47hp. Before installing was 56hp!!

What may cause this?
Maybe I did something wrong?

Notes:

• Throttle body tighten well, no air leaks.
• TPS adjusted well on 465.
• Throttle body needles tightened and released half a turn.
• Idle speed is perfect. 1100 - 1300 rpm.
• No check-engine errors.
• ECU NOT flashed or tuned.