I also use ST30 all the way round. On the front hairline I set it back just a few millimetres and run the tiniest amount of white glue along the front to keep the lace edge down. As Rob says great hold and gives the best looking hairline.
Like Xeon I also get a red line on my skin at the front edge of any ST30 I use on the front hair line. It doesn't happen always, and never on the ST30 on the side or back, but was the reason for me using white glue on the front. Anyone care to guess at why this happens?