My take on it so far… impossible to achieve this way. Timeline, Ease functions bug out everything. I’m assuming it’s either because of float <-> vector conversion internally (unlikely) or because it hits some sort of limitations for numbers > 360° (full turn). “Make Rotator” or “Lerp(Rotator)” on their own, work as intended, as long as no Timeline or Ease function is linked to them (even if the number is > 360°). But no type of animation, linked to that works (frustrating) 
This was just an idea I had and in theory it should’ve worked beautifully.
Get a random number in the range of 60-150, multiply it with a delta (12) (so that it always ticks a multiple of the symbol length on the reel → 2-5 full spins) spin to that number and… Jackpot (pun intended)
I think this has to be done in a different way, by randomly spinning and making a nice animation and at the end somehow read the symbol from the final position.
P.s. Both animations, with Timeline and with Ease function, looked pretty bad (let alone the fact that they always messed up the outcome). There’s gotta be a better way.
Any suggestions, workarounds?
I’m open to ideas