So yeah, putting Broly aside.
Everything in the Saiyan saga is fine and everybody agrees from what I see.
It seems like the majority agree the 50x SSJ multilier is the most reasonable thing to use.
I think something that is being ignored is the fact that power levels, while not perfect for exact multipliers on their own, are accurate indicators and plot devices made to show who is stronger and faster in most cases in DB, as long as they aren't suppressed or hiding further forms. Thus higher power level means that at the very least an individual scales above a lower power level unless explicitly stated otherwise like with Trunks and Cell. Jeice, Burter and Recoome still need to be scaled above Goku KKx4 for obvious reasons, as they are superior overall based on narrative, power level, and treat a stronger and faster Vegeta like an infant.
As for Goku's scaling on Namek. Goku is so much faster than Recoome, Jeice and Burter that they can't even see him move up close, or from a distance, and he can casually speed blitz them all at the same time, despite them being superior to his SS Kaioken x4 state.
The official synopsis on the back of the manga states outright that Goku increased his power and speed 10 fold on his way to Namek, which lines up perfectly with his showings against the Ginyu force, and his own power level which went up from over 8000 to 90,000. I mean the claim was made that they were referring to Kaioken in the synopsis however that is never stated and just an assumption. There is no reasonable reason to disregard the synopsis statement since it is consistent with the narrative, speed showings and power levels of Goku on Namek.
One last thing we should address while on the subject of reasonable scaling for speed is the fact base Goku vs Frieza >>> Base Namek Goku.
Upon leaving the healing chamber Goku says he is far stronger than before, he thought he had reached his limits before but is amazed that he surpassed them and that his new power is almost scary to him, implying again that he should be vastly superior to his previous states, including with kaioken since his new power exceeds what he thought possible and is beyond anything he thought possible for himself, and we know he was well aware of his ability to use Kaioken x10 as he stated he could while going to Namek, and he even used kaioken just to to show off to Ginyu.
Vegeta also says Goku completely shattered his previous limitations, thinking he could even be a super Saiyan. This is huge because Vegeta is well aware of Goku's Kaioken ability and previous base power, yet feels his base form is vastly beyond any of that, possibly at super saiyan levels. Not to mention power level wise he goes from 90,000 to 3,000,000 which is a 33x multiplier making it narratively consistent. These directly imply that his base should scale above Kaioken x10 Goku from the Ginyu saga.
Relevant scans
So to summarize I propose the following adjustments for the Frieza saga scaling
Recoome, Jecie and Burter > 3.056c
Namek saga Goku = 7.64c
Namek saga Goku (kkx10) = 76.4c
Frieza battle Goku > 76.4c
Frieza battle Goku (kkx10) > 764c
Frieza battle Goku (kkx20) > 1,528c
Frieza (50%) > 1,528c
Frieza (100%) > 3,056c
Goku (SSJ) > 3,820c
These are the recommended alterations I would put forward, and I believe that there is substantial evidence to back up all the increases above as conservative estimates, with no significant contradictions.