The best mechanic that I have learned for preventing the IW is dropping the whistle out of my mouth at the snap (I usually am the R.) The only time I deliberately keep it in is when I am anticipating the QB taking a knee.
As for the R blowing his whistle often, I rarely have reason to blow my whistle on a normal run or pass. The wings should be doing that as they have the forward progress and spot. I have been the U some games this year (subvarsity to let a new WH work) and at the U position I rarely need to blow my whistle either.
I am trying to get the guys in our association to drop the whistle at the snap but it is hard to break old habits. At least on my crew I have some pull (I hope!).
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