[MA,LT] Estoc+Defensive Grip+Eye Slit?

[Gigermann]

Given:
Normal penalty to hit the eye is -9; normal penalty to hit the eye slit/chink is -10. Using an estoc with a half-sword Defensive Grip option (unless I've missed something) is -4 to "targeting chinks in armor".

Problem:
I almost hate to ask, since it appears to be an obvious Murphy, but: I presume the "chinks" reduction for estoc+DefGrip does not reduce the overall penalty below the "normal" penalty for the location-in-question? (In this case, reducing the penalty to hit the eye to -6, well below the un-armored -9.)

Second, how would you expect the Targeted Attack (Thrust, Eye Slit) to interact with the overall penalty situation? Max improvement for the Technique would be -5 (half of -10). Does the estoc+DefGrip improve that to -1? Seems excessive? Maybe not? (It's definitely not cheap.) Or, if the above is a Murphy and doesn't improve beyond -9, would you only give a -1 improvement to the TA technique (total, -4)?

(Disclaimer: apologies if this has been asked & answered before; I failed to locate it—I did look :P )