I wonder if the maximum combination of 5xwilds with the other high paying symbols in view, multiplied by 5, might come quite close to that maximum payout for 5 reels wild? Likewise the rolling reels I'd say it's quite likely that if you get those reels lined up in the best possible positions the final payout could start approaching that 5 reels wild because you could, for example, get many multiple-5oak-(some-with-wilds) hits at the maximum 5x multiplier all off the same spin...
I have to say the 'running wilds' feature has been massively cruel to me so far as well, the only one I have not seen even a moderately good bonus round from - the 'wild night' is really disappointing if you don't get a single wild night in the whole 25 spins too but I also saw 5 in one bonus round too, mostly 2 reels wild and all paying out between 10-100x bet ...
No reasonable comparison between max return possible between Kimi and Sophia features.
The difference in the max win possible is significantly greater in Sophia running wild feature because the multiplier is 243/5 times greater if a full screen of wilds is awarded. That's a whopping 48.6 times more!
I haven't done the exact max win calculations for Kimi for the min. stake of 0.30, but it's not necessary.
5 wilds * 5 ways = 10*5 = $50. Adding other top paying symbol combos which pay $10 or less, won't increase the multiplier factor by an amount anywhere near enough to rival the max return possible in the Sophia feature, if a full screen of wilds is achieved.
A full screen of wilds in Sophia feature = $10 * 243 ways = $2430 on the min stake of 0.30.
The same logic can be applied to the rolling reels feature.
There's little doubt, that features 2 and 4 are very high variance, whereas features 1 and 3 are on the lower end of the variance scale, in comparison.
The stacked wilds make all the difference!