TQQQ re-balanced with QQQ Strategy

Strategy is to hold both TQQQ and QQQ at once. Re-balance every 6 months or every 12. This should give you lots of juice in a good market while still having something in the tank if the market goes to shit. (if TQQQ was around for Dot.com or 2008 it would have gotten annihilated >90% loss). Timeline is very long +20 yrs and would expect to lose at least 60% during a shitcyclone.

Questions are: What ratio? methinks 80 QQQ/20 TQQQ. I simulated this in excel since 1971 (used X3.1 down and X2.9 up for TQQQ to account for decay and fee's) and it tells me 50/50 is the way to go with an 5X return on just holding QQQ.

note: this would also apply to any 3X leveraged product.

Am I missing something here? I can send my excel file if anyone is interested.