Eh, that's pretty normal. I've had a lot of block-less days without any blocks when I was mining and I never really had to shift away from the pool. The profits in the long run would be the same anyways
While that is correct, the long run has to be set to infinity for this actually to work out, but if a "long-run" that is a reasonable period of a few months or years, then the pool's payout will be very different if you mine to a pool that doesn't find a block for a whole year, there is no guarantee that the next year the pool will find double the blocks to make up for that first year if you mine on the same pool for a 100 years, it's more likely to even out, but that isn't practical.
There are a few things you need to remember when thinking that all pools will eventually pay you the same, as difficulty increases your pool needs to ramp up real fast to cover up for the losses, it's like giving someone a loan without interest, the more the "bad luck" period lasts the more people leave the pool which makes things even worse, so instead of things breaking even next year, you could be looking at 3 years.
Even if the pool hashrate stays constant, it will find fewer blocks as time goes on due to the difficulty increase, it just keeps getting worse and worse, it doesn't matter how you look at it if you are stuck with a pool that isn't finding blocks NOW, it's just a bad deal.
This is the reason why > 90% of miners mine to PPS pools, it's not worth taking the risk, I rather pay 2% more fee and be guaranteed to get payouts than have to wait for a week, month, or a year just to save 2%, where in reality you won't save anything if the difficulty increases before you even out.
OP:
If I were you, I would point enough gears to PPS pool to cover the electricity bill for all miners.
For example, 10 miners, need 100$ a month in total, and each miner makes 20$ profit.
point 5 of them to a PPS pool to make 100$ to pay the whole bill.
point 5 of them to solo to mine for "free".
This way, all you risking is the "cost" of the miners, in fact, just the devaluation of the cost since you can still sell them at some point.