DISCLAIMER: Most of these suggestions are not original to me. I take no credit for them.

-Each level of MSI reduces dash cooldown by 1 second.

-Some (new?) shields deal a small amount of damage when bumping or being hit.

-Allow bashes to be performed whenever more than 50% shield health is present. Offer protection during the bash.

-Replace the Backfire Barrier's 3 seconds of high speed + 5 seconds normal speed with 8 seconds of MSI Max.

-Swap the combos of the Flourish's standard & charge attack patterns. Modify the BTB accordingly.

-For Lockdown, make the Striker boost have to recharge at the same rate as the Recon Cloak or Guardian Shield.

-For Lockdown, calculate any UV defense values after considering the base defense (100 in T3 LD).

-For Lockdown, set the base defense lower (maybe to Chaos values in T3) so matching defense types becomes a useful consideration.

-For Lockdown, shorten invincibility frames so faster weapons can be effective (without letting, say, Blitz, get OP).

-For Lockdown, remove footprints.

-For Lockdown, reduce the damage dealt by all weapons (to slow the pace a bit, and balance with the above).