If you haven't already seen it, your list is quite close to this one:
https://www.youtube.com/watch?v=8MJDeJ8kCWw&ab_channel=AuspexTactics
With occult termies being obsec now, a good strat seems to be putting bunches of rubrics and occult termies on objectives with cult of time. Remember that warped regeneration can also revive dead units, so you can get up to 2 revived occult terminators per round between time flux and warped regeneration.
I assume you say you have 17
CP because you're using the WC4 cabalistic ritual psychic action each turn for 5 turns.
Depending on your opponent, you don't have a lot of big threats on the board and magnus is likely to get zapped. Consider not running him at all in a list like this that is obsec heavy, as seen in the auspextactics video I linked. I think magnus lists need big threats in their face fast via crystal/duplicity/temporal surge cavalry/dreadclaw drop pods
Consider taking a few rhinos for your rubrics as in the auspex video, they have 5++ now and inferno bolters
I'm personally not a fan of tzaangors anymore. They used to be a great bomb but not so much anymore in my opinion
I wouldn't suggest baleful devolution, with a +1 to psychic tests I've computed it has an expected value of 0.82 mortal wounds per cast. I'd take something else, anything else.
athens scrolls are great for getting high
WC spells off more consistently with exalted sorcerers such as presage. Consider taking if you drop the shaman and his relic
If you could I'd appreciate your thoughts on my own
TS list:
https://www.dakkadakka.com/dakkaforum/posts/list/801491.page