Pretty good list, but I think I can offer some help:
Goku:
Initial: 675
Piccolo:
Initial: 675
I don't think Goku and Piccolo were ahead of their scouter readings, 416 and 408 respectively. There's nothing suggesting that reading was wrong. There's no power up scenes at all except the panels depicting Goku charging the KMHMH or Piccolo gathering the Makankosappo.
Gohan:
Initial: 1
Post Training: 1,400
Krillin:
Initial: 206
Post Training: 1,400
Kuririn > Gohan imo, considering in their arrival of Namek, weighted Kuririn had about the same read as Gohan without weight clothes. There's the spaceship train showing Kuririn running out of his fight against Gohan though, so I'm not entirely sure about it.
Yamcha:
Initial: 177
Post Training: 1,300
I don't know about Raditz > Yamcha. Raditz was said to rival the Saibaimans. While Yamcha resorted to use a Zanzo-ken (at least it seems like it), he would have won if not taken by surprise.
Saibaiman - 1,200
Raditz - 1,250
Yamcha - 1,320
Goku:
Initial: 8,000
Fake Initial: 5,000
What do you mean 'fake initial'? He was never read as 8000, so his 5000 power level should be his initial.
Post Training Suppressed: 60,000
Actually, it should be a little over 60,000. After fighting Goku a little, Ginyu stated he's even better than thought (60k).
Chapter: 284 (DBZ 90), P3.6
Context: after fighting Goku for a little bit
Ginyu: “I see. Seems you’re even more capable than I thought…”
I like to think he underestimated Goku here by the same amount he underestimated Goku's 90k (thought it was 85k).
Did Gohan get weaker?! Why?
Post Guru Power Up Namek Saga: 16,000
He was stated to be above 10,000 by Jheese. The Daizenshuu has it at 14,000 and Kuririn at 13,000. Honestly that as high as I'd go. Don't you think Jheese would have specified if it was that high? He would have stated "it's close to 20,000" rather than "above 10,000" imo.
Post 2nd Zenkai: 50,000
Post 3rd Zenkai: 500,000
When this 3rd Zenkai happened? Are you referring to his nap?
Piccolo:
Initial: 2,400
Post Training: 450,000
His post train level seems way too high, considering Nail stated that he
might be able to beat Freeza after rejoining Kami, that is, he wasn't 100% sure. I'd put Kamiccolo Freeza saga only a notch above 1st form Freeza or so:
Chapter: 295 (DBZ 101), P1.4, P2.1-5, P3.1
Nail: “I-I’m astonished…I don’t know what kind of training you’ve done, but you’ve acquired unbelievable power…Still, it’s unfortunate…If you had only returned to the original, single Namekian you were, you might have been able to defeat even Freeza…”
Freeza:
2nd Suppression Form Powered Up: 1,200,000
Piccolo:
Post Nail Fusion Initial: 1,400,000
Seems a gap way too pronounced. They fought pretty evenly with Piccolo getting the last word at the end. Kuririn even thought they were equal. Do you really see this gap as the same between Vegeta (24k) and monster Zarbon (28k)?
Vegeta:
Base: 6,666,667
Piccolo:
Initial: 1,500,000
That's in the Mecha saga, right? Piccolo challenged Vegeta, saying "huh, you wanna try me?", which would imply Piccolo more or less caught to Vegeta here IMO. I don't see Piccolo being ready to fight Vegeta while being in an one-shot range. Gohan even said in the Freeza arc Piccolo must have a reason if he wants fight:
Mecha Freeza:
Initial: 300,000,000
Full Power: 600,000,000
Freeza said that now he
probably go alone against Goku, that is, he wasn't sure. Don't you think he'd be more cocky with a whooping 1.2x gap (à la Vegeta 24k vs Dodoria)?
Chapter: 330 (DBZ 136), P13.3-4
Cold: “The Earthlings don’t matter, but the Super Saiyan alone we absolutely must exterminate, by any means. The one who holds the greatest power in the universe must without a doubt be our clan”
Freeza: “We can definitely defeat him if we go at him together, Papa. And I’ve powered up too, so I think I can probably go alone.”
"He
thinks he can
probably go alone", I.E, he isn't sure of anything. Unless you think Freeza was expecting Goku to power up?
Vegeta:
Post 2nd ROSAT Base: 30,000,000,000
Post 2nd ROSAT Super Saiyajin: 1,500,000,000,000
I think Vegeta's gap over 50% MSSJ Goku is too pronounced here. Don't you think Vegeta would show off more of his arrogance if he were that above the power Goku showed Karin? Sure, he displayed confidence, but he wasn't overflowing of it.