Can confirm the str varying. Going to give some info based on friends’ ss and told numbers along with simply checking my own rock info.
Level 1 gives 69cs
Level 2 gives 84,200cs
Level 3 gives 84,201cs
Level 4 gives 183cs
Level 5 gives 55,999cs
Level 6 gives 129,043cs
Level 7 gives 240,030cs (used calculator to fill in based on 240,012cs drop for level 7 -> 8 ss)
Level 8 gives 18cs
Level 9 gives 666cs (two friends had this)
Level 10 gives 58,633cs (used calculator to fill in based on 151,366cs increase from level 10 -> 11 ss)
Level 11 gives 209,999cs
Level 12 gives 8,899cs
Level 13 gives 69cs (two friends had this)
Level 14 gives 329,021cs (used calculator to fill in based on 329,020cs drop from level 14 -> 15 ss)
Level 15 gives 1cs
Level 16 gives 42cs (three friends had this)
As for why op’s ss had 0 stats for each level, I think there might have been a couple of factors for this. An iOS user got “null%” for str and int on her rock through the leveling process until uninstalling and reinstalling pimd when her pet rock was around level 9 finally allowed her to see the stats each level increase would give. Multiple Android users said they straight up saw zero stats throughout their leveling process despite one making sure he had the latest update. This may be the case for op.