[Gift]

Disclaimer: I take no credit for this guide. All credit goes to SirRFI.

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Swords Vella:

•  is your primary source of damage. Connecting crosscuts is essential for effective damage.
  
•  is your secondary source of damage. Use in big time gaps. It deals slightly more damage than the filler below repeated to take about the same time.
  
•  is your filler damage, for small gaps. Omit Tumult Blade if running out of time. Can replace Storm Step with 2 normal attacks if the gap is little longer and You are already in range.
  
• On bosses that have uncrosscutable attacks, use  as a counter-reaction (after the attack has begun and You recognized it) rather than pre-reaction (waiting for an attack to show up).
  
• Learn which projectiles can be  and try to reflect them, as it deals more damage than crosscut.
  
• Knowing boss patterns, try using  to increase your damage. Remember to  before it expires to get SP back. Given my luck, people usually stun the boss out of sudden when I use that, despite they normally don't - annoying.
  
• Use  as safety option, or when You perfect cross but didn't deal damage to follow up.
  

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Chains Vella:

•  is your primary damage, with and without .
  
• + every 10 stack for optimum damage, unless the boss has special moves or phases that could interrupt it - in that case You need to know when You can use it as soon as possible and when to keep 20 stacks (which grant extra time) to use afterwards that pattern.
  
• Remember using  at the last second (when displayed 0 or 1) for extra damage and free stack. You should have your SP filled, so that's not a problem.
  
• After  expires, use your SP to refill the stacks quickly with 
  
• Generic transformation tip: using 20 stacks +  with maxed transformation (duration-wise) will expire before first transformation ends, and by the time transformation ends You should be able to get another 10 stacks and use second transformation (which has it's own duration time rather than keep whatever was left from the last one). I use this tactic everyday at Eochaid (aka ebola).
  
• Use  when stamina is very low, then  (assuming  was enabled). Reactivate  by doing this again once stamina has regenerated.
  
•  use it if there are multiple enemies and they surround You (mobs, big multi-part bosses like Kraken or Bark).
  
• BO some low flinch-amount bosses (like Lugh) with  for extra $$$. Getting SP for that will take long enough to get 20 stacks.
  

[Gift]

Kayo: TS vella isn't terribly complicated.
She basically just comes down to not getting hit.

The only real tip of note is telling people that gale splitter isn't actually better than a standard double cross here usually. Unless the bosses current attack pattern ends and doesn't allow for more double cuts

Gale Splitter is useful when the bosses last attack carried them away from you, or they aren't going to immediately attack again. Double cross is better pretty much everywhere else