It's a good idea, to make SoT a duration multiplier (x2?) rather then a static additive.
I would veto this if I could. Most buff durations are long enough as-is that making SoT a simple multiplier would rarely ever influence anything of meaning. The fact that it's a flat +20s/+10s means that it actually has worth as a PL6 spell in lengthening short-duration-but-powerful effects. (Though I wish it benefited from some sort of PL-scaling.)
That being said, the absolute fundamental problem is not mystic, ascendant, BDD, or SoT, it's that Brilliance is a busted inspiration and has been ever since 1.0. Instead of just removing it as a party-wide chanter invocation buff and adding it as single-target special buff the cipher gets access to at PL7, Obsidian should fix Brilliant and bring it in line with the other tier 3 inspirations.
edited to add: when the patch notes about Brilliant being added back in dropped in the beta patch notes thread, there were already giddy people like me talking about how ciphers just became brain-dead automatic inclusions into any serious party. It's not like Obsidian couldn't have seen this coming.
(Frankly, you don't even need to combine with ascendant to bust ancestor's memory. E.G. just put brilliant on a wizard and selectively keep re-casting level 4 Minoletta's crushing missiles. Unless they removed its interrupt since I last tried this, it basically means you can stunlock any boss in the game (even if they have a lot of concentration shields) while dealing crap tons of damage. brilliant is just fundamentally broken as-is, as this example illustrates you don't even need to metagame it that much to really wreck house.)
Edited by thelee, 17 September 2018 - 09:18 AM.