You got lower fees, but you changed your asset allocation at the same time. If your previous asset allocation was right for you, this move will have unbalanced your portfolio at least slightly. Assuming the IRA had exactly $10k, you made the following changes:
US stock market: +$4,620
international stock: -$3,610
US bond: -$710
International bond: -$300
I'm going to make a wild guess and say you have 2 years of IRA contributions and no other investments. In this case, I think changing to admiral shares was a mistake, since you gave up all of your bonds and international stocks just to lower your already-low fees on domestic stocks.
However, if you have other tax-advantaged accounts (for instance, a 401(k) from your job), it might be worth undoing the change in your allocation by using that account to buy what you lost in the IRA. Personally, I manage my allocation over all my accounts combined, and let individual accounts get way off my chosen allocation as long as the total stays on target. This has some moderate advantages: I get to keep my taxable accounts heavy on VTSAX, which has low taxes. I get to make smaller accounts 100% VTSMX and switch to admiral shares as soon as they cross the $10k mark. The extra work is not bad.