Best subsumed abilities for Speedva and Slowva (Nova)?

I have seen some older posts, but was wondering if any good combos have been found up to date.

Another side question, I have my speedva down to 10% ability strength. Can I go lower?

submitted by /u/Entophreak
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source https://www.reddit.com/r/Warframe/comments/1064ta8/best_subsumed_abilities_for_speedva_and_slowva/