Examples of suppression at higher Super Saiyan forms

[kriss-]

Perfect Cell versus Kid Gohan

hapter: 409 (DBZ 215), P3.5
Context: after Gohan says he can beat Cell
Cell: “Well then, I’ll show you…! My fearsome true power…!”

Chapter: 409 (DBZ 215), P14.5
Context: after Gohan attacks full power Cell
Cell: “Impossible…Why did I take so much damage from just 2 punches…?”

Chapter: 410 (DBZ 216), P6.3
Context: after Gohan beats Cell up
Cell: “Unbelievable..! To think that someone like this could exist in this world…I’m completely losing in terms of power…But a battle’s outcome is a different matter…”

Evidently, Kid Gohan SSj2's power prior to Cell powering up to his full power was less than what Cell was truly capable of. That of which Cell was able to surpass, but Kid Gohan easily overpowers him yet again. It's after Kid Gohan does a silent power up that he realizes that he's losing in terms of power; but not before-hand.

Goku Ssj3 versus Innocent Boo

Chapter: 506 (DBZ 312), P13.1
Context: still talking about how they’re no match for Boo
Goku: “…But there is one way we can win!”
Vegeta: “You want to say Fusion, right? Well who cares about that?!”
Goku: “Huh? You know about it?”
Vegeta: “I saw it from the afterlife

Chapter: 510 (DBZ 316), P8.2
Context: as Goku fights pure Boo
Vegeta: “Kakarot…You’re incredible…I am simply no match for that Majin Boo…You’re the only one capable of fighting him…”

Chapter: 510 (DBZ 316), P12.6
Vegeta: “The truth is you were right [that I’d be killed by Boo]. That Boo is stronger than I imagined…And so are you, Kakarot…”

So Vegeta saw Goku's SSj3 form from the after-life. Based on what he saw he would be able to come to some sort of estimate about how strong he actually was based on his movements. Supporting evidence for this is here:

Chapter 343 (DBZ 149), P7.4
Vegeta: “I’ve realized by watching your faint movements up to now…That you guys don’t seem as terrible as the rumors made out.”

When Vegeta saw Goku Ssj3 from the afterlife he should have been able to accurately gauge how strong Goku SSj3 would have been based on his movements. However, the actual power out-put and speed from both Kid Boo & Goku superseded all his predetermined expectations of their battle power.

These examples infer suppression.