a starter would be to ban downward vertical manouevres with low pullouts in high inertia aircraft, full stop!
and
Half or full Cuban Eights look nicer and are a lot safer
Not sure which half cuban you've been doing but the one I was taught has a significant downward manoeuvre akin to the second half of a loop which I assume you're referring to in reference to this accident.
and are a lot safer
Nope, just as easy to bugger up, twice if you do the full cuban.