Was Goku at full power when he used 3x Kaioken?

[KyuubiAhri]

Hey, Freezamite. I was about to ask you that, but you beat me! So, how does that seem to you?

Goku (post Vegeta's headbutt and out of breath): 7.000
-3x kaioken: 21.000

Vegeta: 18.000

That's impossible because bulma's scouter blew up when reading goku's PL.That means KKX3 goku is >22.000

Bulma's scouter blew up after Goku surpassed the 21.000 PL, so he could reach the 22.000 PL or he couldn't, but it's not certain.
Now, regarding the numbers, while I would put Goku a bit over 7.000, it's important to note the difference between Ki sensing, scouter readings and real strength available to fight.
Ki sensing is the most imprecise of the bunch, it depends on too many factors to be considered reliable for anything that isn't a direct comparative between two fighters (it depends on the power of the one sensing the power, on the attitude of the one's sensed, and even then the result is just an "approximation" that has to be contextualised and not a concrete number. On the other hand it provides other valuable information like who's the fighter -in case it's a known fighter- or if he has good intentions or not).

The scoutter it's by far the most precise device when it comes to power sensing. It not only senses the ki emitted, it also takes into account factors like the body mass of the fighter (that's why Goku and Piccolo's PL increased when they took off their heavy clothes, and why a scoutter would've noticed Trunk's -when he fought perfect Cell- weak-point even before the fight started), but there's a factor not even a scoutter could measure which is the pain and how it affects a given fighter.

Goku had between 21.000 and 22.000 units of measured strength when he activated the KKx3, but the KKx3 was a far too much for him (it punished his body far more than the KKx20 in Namek) and Goku was visibly in pain both when he activated the technique and after doing it, so his real effective power should have been between 18.000 and 19.000 in it's highest moment, and from then onwards in constant decrease although always above Vegeta's effective power (who was always below Goku's until Goku stopped the attack).

I personally think that goku was around 22,500 initially when he activated KKX3 but due to the strain hi's power level rapidly dropped

 

[Zippy]

Hes apparently 8k at full and the scouter breaks at above 22k. The most logical option would obviously be to assume it was fp and 24k rather than trying to find the slightest difference in between.