I'm with you, seems like a no-brainer to me. 60% APY, liquid, plus the current airdrop for another 50+ days and future airdrops. I recently doubled my position there as well.
Right now my focus is on LEO. I'm trying to hit 50k of that while it's still this cheap and then I'll probably go back to stacking HIVE. I really think LEO is in for a pretty significant liquidity squeeze here in the next 6 months. For sure in the lead-up to ProjectBlank, possibly sooner. Plus, I want the LeoPower for votes. It's just a LOT easier to stack things when they're 20 cents as opposed to even 30-40 cents.
I DO think you might be better served to put your PolyCUB airdrop into xPolyCUB but, as you say, there's only so much to go around. If it works like Khal thinks it should with his design, then just a few xPolyCUB could be worth quite a bit in a couple years. That said, if it does indeed work like Khal plans, then there's no reason the future xThorCUB and xAvaxCUB and xFantomCUB shouldn't work just as well or even better than PolyCUB. In that case, you're not necessarily missing out on much with PolyCUB. You're basically just pushing your payoff back 3-6 months.
Time will tell as always.
RE: The Ultimate Savings Account.