Using bulky powders is one "solution" to double charging, however, it is preferrable to clean up one's reloading practices such that double charges never happen.
So which is it? Are you claiming that < 70% charges of Titegroup will detonate, or are you saying merely that 70% charges will make a double-charge obvious?
If it's the former, we need some good hard evidence. If it's the latter, maybe you need to clean up your reloading practices insteading of blaming the kaBoom on Titegroup.
USPSA/IPSC shooters have shot millions of rounds with Titegroup and even lower volumetric charges of Clays and don't seem to have detonation problems.
In summary, What is your thesis?