If you remember, the Shinkiro sustained quite a bit of damage while Rolo was piloting it in Turn 19. He wasn't as able to pull up the absolute defense system as quickly as Lelouch can because 1) the caluculations were too complex and 2) he can't type as fabulous as Lelouch.
My guess is that aside from the reasons you listed, the fact it's probably damaged means Lelouch just hasn't gotten around to getting it fixed. xD
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My guess is that aside from the reasons you listed, the fact it's probably damaged means Lelouch just hasn't gotten around to getting it fixed. xD