I haven't trimmed mine, however I have trimmed decks, that are uneven in size, this is only a problem when you are one of those who like to riffle your deck when you shuffle, it is not a problem when you shuffle over hand. When you shuffle over hand, let say your right handed, your right hand drops the cards into your left hand, use left hand thumb to slide top card off stack in right hand, to drop down into left hand. The size difference has never been a problem for actual reading. however the card are amazing and vibrant when it done, so continue, you won't regret it, even if the cards are an uneven in size.
Another shuffling trick for odd uneven sized decks.
hold deck in right hand (if your right handed)
hold deck over the table about 1 inch above table surface ( or rest edge of stack on table at an angle) so that you can slide the cards off.
with left hand finger tips, slide top card off the stack from right hand down onto the table.
repeat through out the deck, over and over until you feel the deck is well shuffled.
you will get a good mix, cause with each slide, it varies with how many card your fingers will slide off the stack, ( 1 - 3 card) or (1 card) or ( 6 cards)