As for your math in the Redirect attack, I do not believe you get any extra bonus other then BAB and Dex. Could be wrong, but if you could stack Weapon Focus, PBS, and even lightsaber atonement bonuses on top of the +5 from Shien, seem why would the +5 from Shien even need to be there in the first place...
Also, here is my take on a Redirect/Defensive Jedi Master. 32-pt buy, Kel-Dor for Dex/Wis bonuses, and a bit more Defensive minded build
Deflection Master CL 15
Medium Kel Dor Jedi 7/Jedi Knight 5/Jedi Master 3
Init +16; Senses low-light vision; Perception +16
Languages Basic, Kel Dor, 2 unassigned
Defenses Ref 32 (flat-footed 28), Fort 28, Will 32; Block, Deflect, Precise Redirect, Soresu
hp 100; second wind +25/50; Threshold 33
Immune fear effects
Speed 6 squares
Melee lightsaber +21 (2d8+8) or
Melee lightsaber +21 (2d8+9) with both hands
Ranged by weapon +19
Base Atk +15; Grp +19
Atk Options Improved Quick Draw (lightsabers)
Special Actions Force Fortification, Quick Draw, Redirect Shot, serenity, Shien
Force Powers Known (Use The Force +20) Force shield (2), negate energy (2), rebuke (2), barrier of blades (2), deflecting slash, Shien deflection
Force Techniques Improved Force Shield, Improved Rebuke
Force Secrets Linked Power, Quicken Power
Abilities Str 12, Dex 18, Con 10, Int 14, Wis 18, Cha 16
Special Qualities build lightsaber, keen force sense
Talents Block, Deflect, Force Fortification, Improved Quick Draw (lightsabers), Improved Redirect, Precise Redirect, Redirect Shot, Shien, Soresu
Feats Force Readiness, Force Sensitivity, Force Training (2), Improved Damage Threshold, Quick Draw, Rapid Reaction, Skill Focus (Use the Force), Weapon Finesse, Weapon Focus (lightsabers), Weapon Proficiency (lightsabers, simple weapons)
Skills Acrobatics +16, Initiative +16, Perception +16, Use the Force +20 (may reroll to use Block or Deflect but must keep the result of the reroll even if worse; may reroll to search their feelings or sense the Force and keep the better result)
Possessions lightsaber (self-built)
Not too far from your build Zenji. I instead decided to build around every Redirect-themed talent in the game with great options you took. Now with this version, the first successful Redirect of the round doesnt make it Deflect count towards the penalties, and deals +1 die of damage on hit (Improved Redirect and Precise Redirect). Choose Soresu over Shii-Cho for Deflecting Slash synergy (Get to redirect the shot you negate with DS if you have Soresu) and made sure to have the Shien form powers.
Also built this with Defense in mind in a more general sense, you added powers like 2 uses of Rebuke, Negate Energy, and Force Shield to help protect him when his lightsaber cannot. The Techniques add the ability to help protect others (Ability to Rebuke a powrr against an ally or extend your Shield to other ally)
As for feat, I built with quick reaction and defense in mind. He can use FPs at will. He can react to the same trigger twice once per encounter, and due to his low Con, He badly needed Improved DT. Back to talent, I felt like you were 100% with taking Improved Quick Draw to be always ready to deflect and added Force Fortification as a way to negate hard hit his defenses cannot handle.
This guy is at home in the middle of a firefight. Acting as both a barrier for his allies and a unexpected trap for his enemies.