Don't Offer Review Books In Only One Format
Which is cool.
But let me make this clear:
The odds of me reading your book as a reviewer (or award nominator) are much higher if it's in a format I typically use. And I bet others are the same way.
So send that book in PDF and ePub and Kindle formats. (And make print available if you want; some folks swing like that.) PDF only? I may or may not read it. If it has DRM on it? I may or may not read it.
The whole point of sending books to people for consideration for awards - or for review - is to make it easy on them to give your book a chance.
Offering only one format or another is making it hard for them... and that's not a good recipie for success.