Master of Blades and alternative parry rules

Alright, so the problem is, that we found parry too weak, so we implemented two things: The defender may choose which hit to parry and two swords allow a re-roll of that parry attempt. Works great imo.!

The problem is, that I don't know how to fix this combined with Master of Blades. It says that you may parry the two highest dice rolled, but according to our rules, you may pick. It's already strong with the rulebook rules, but this would just make it even stronger! One solution could be to make it into a flat 5+ parry, which may be re-rolled, since most Dwarves will never be hit on 3+, and 5+ would be in between 4+ and 6+.
I know there's a lot of players out there with the same parry rules as we use, so I'd love to hear your solution to this skill!  

I know I wrote, that people playing with the same rules might have a solution for this... But someone not playing with them might as well - so please shout out :-D

Use the rule as written?  

That was a thought I had as well ^_^ it makes the skill less attractive though. But in the end it might be the best solution - then it's just a risk to take it :-P