Random ideas to calm yourself down:

5 S9 = 65THs = 0.15606794 BTC/day theoretical.

7 days no block at all = 1BTC missing.
preload 1BTC into your kano payout address and stream out 95% theoretical a day to your primary address.

Don't take out more when the pool is lucky.

Get nervous when the 1BTC buffer is gone.   << less likely due to 100 block avg.
Celebrate when the 1BTC becomes 2BTC, shrink buffer back to 1BTC.  << more likely due to 100 block avg.

Revisit every difficulty adjustment.