I usually play the laggier end of TAG and I sometimes open A2s - A9s UTG when following conditions apply:

1) I'm playing 100NL or higher.
2) People acting after me are nits.
3) My image needs reworking to more loose.

I just checked a PT database consisting of 10k hands of 100NL and I opened with them twice of 39 times I was dealt them.

In a nutshell my advice to you is don't even think about opening them from UTG yet.