Here is my Idea:

Go with 5 judges instead of 3.

3 of them are Ringside and 2 of them in a sound proof booth watching on a HDTV.

After the fight you take all 5 score cards and remove the 2 cards that have the widest margin from one another..

Leaving you with the final 3 score cards to use.

Example:
Judge 1 Ringside - 118-110 Fighter A - Remove
Judge 2 Ringside - 116-112 Fighter A
Judge 3 Ringside - 116-112 Fighter B - Remove
Judge 4 Booth - 115-113 Fighter B
Judge 5 Booth - 115-113 Fighter A