Maybe level 5 Strip Shield
No? Even currently Tome has lv 2 Strip Shield only, but that is enough. Oh~ im so lazy to explain..
1st. Any Magical Scholary/Sage will definetely have IC. With that amount of dex you have, its almost 80% of successful rate for lv2 Strip Shield. Why bother to changed it to lv5? So that if could be 100%?
Even if you failed once, but within 4 strips, the shield will be eventually Stripped somehow. Unless they r Chemically Protected.
Second, if the Scholary/Sage is Battle-Sage mode, lv2 Strip Shield wont help much since you do not have enough dex. But the Crit-Bonus already plays well in that build.