This is a game where combat rolls are based on a flat difficulty and not based on opposed rolls, i.e. you can be very good with the lightsaber skill but this does not make you better at defending yourself with this weapon against attacks.
Then, negative dice which can generate Disadvantages and Despairs (needed in order to activate Improved parry/reflect) are:
-Setback dice, mostly come from outside of character effects, like armor, cover, lack of light, etc. A few come from in character effects (talents), the Defensive Training talent (useful for Improved Parry only, there is not such talent for Reflect).
-Challenge dice, some come from out of character like flipping destiny points and also, depending on the GM, they may come from severe environmental effects. Then, you have in character effects (talents) like Side step (it help for Improved Reflect) and Defensive Stance (it helps for Improved Parry) and Dodge (which helps for both Parry and Reflect). Notice that this talents also cost strain to use, so using them in combination with Improved Parry / Reflect will cause your PC to suffer at least 4 strain.
That is, the use of Improved Parry / Reflect is not related at all with:
How good you are with the lightsaber skill; more important it has nothing to do at how good you are at Parry or Reflect (independent on the ranks you have on those talents), neither related with your force rank (reflect is a force talent)...
Your best chance to activate the Improved version of Parry and Reflect is by being under cover, wear armour and fighting in darkness (weird isn't it?) and by having ranks in Dodge and Side step / Defensive Stance (I think this is ok, since these three talents represent your character being a better fighter).
So, my concerns are
Improved Parry and Improved Reflect are not related to being good at Parry and Reflect. May be change the name? Improved Parry -> Riposte or Retaliate and Improved Reflect -> Deflect?
There is nothing like Defensive Training for Reflecting fire. I think there should be an equivalent talent that grants your lightsaber the Deflect X quality.
Most of the things that help activating Improved Parry/Reflect are out of character effects, or if you want to use in character effects (Dodge, side step, Defensive Stance) you have to spend even more strain.
These are just some ideas. Any comments on it?