I just bought this Juniper over the weekend and have a few questions. I'm new to bonsai and I'd really love to keep this lil guy alive.

I noticed a bit of old scarring on the trunk of my plant, not sure if it was intentional. There was already some wiring on some of the outer limbs, where part of the wire was also cutting into the trunk where it was anchored, so I've just fully removed all the wiring today.
Now what I'm wondering is, since there is some scarring left on the trunk, should I bother rewiring it again any time soon, or should I let it do it's thing and heal up for a bit? I would like to keep the limbs bending the same direction over time, but don't want to be harming the tree unnecessarily. Most of the damage just seems to be on the trunk. Should wait until a certain time of year?
Also, a question on watering junipers... I previously had a juniper years ago that I'm pretty sure died to root rot, so I'm slightly cautious about over watering. I've read that in summer, it's best to water them twice a day in general. But even though I've been watering only once a day so far, the soil has still been very moist on top, even after a full day of sun (36 degree days) and hot wind the past few days. The stones seem to be keeping the water in quite well and maybe I shouldn't water it twice unnecessarily? Is it possible to over water, even when it has adequate drainage as far as I can tell? It's still very moist always and not even close to being dry on top.
Thanks for any help!