How much does cloak reduce the odds that a player will scan it? Does a player need to have higher scan than my cloak to even have a chance to scan?

I think thats how it works

Last time i checked it was this, if your planet has more cloak then the guys scanning they cant find it, if their scannings above your cloak, same chance as everything else.

well, then cloaking on planets is worthless, normally at lvl 55 and up to subspace sensors mk III I have about 400 scanning during a weekly scan blitz(I have daily scans with just one scanner, weekly scan blitzes where I just do a lot of scans with maxxed out scanners, and monthly MEGA scan blitzes where I get 10s of purgers, tachyon cylinder and subspace seeker, and lod up completly on best scanners I have) and you would need a lot of space on a planet to have enough cloakers to macth 400 or more scanning

I think if you outfit your ship totally with cloaking modules and research it as much as someone might research scanning and you also take up a lot of the planet's space with your best cloaking satellites, then you can feasibly cloak one planet at a time. You'd want to not PVP and it would be a ridiculously paranoid strategy for just one planet. Might be worth it for a dyson but it seems pretty pointless as it is. There will always be someone higher level that can scan it and take it.

There was a thread once suggesting that there should be varying odds of the planet being successfully scanned based on any amount of cloaking it might have.

cloak/scan being the odds of success or something like that.