Hey, nicoleb! I'm probably not the best person to advise you on the limbwalk issue, but maybe @oceans can chime in with some helpful tips.Thanks! I actually watched the Ddrt injury video just before looking at this post
I primarily climb double rope right now, but am working to use Srt for more than just ascent on large trees (where foot locking is going to burn me out before the actual job that needs to be done). I still feel really unstable going out on limbs when I srt vs ddrt. Any suggestions or pointers to make the change feel more natural are greatly appreciated, otherwise I'll just assume it is "Practice,Practice,Practice"
@Tom Dunlap gave a good hint regarding placement of an anchor point more directly overhead. One of the biggest advantages to climbing SRT is the ability to create a new support point just about anywhere you'd like to. Just girth hitch a sling around a branch and add a biner to it, and then clip your rope into the biner for a new support point.
I tend to climb using DSRT techniques, and this protects my relatively novice behind from taking any bone shattering swings due to having a foot slip off of a branch during a limbwalk.
Reg Coates doesn't seem to like the idea of too much dependence on climbing the rope, as I do, versus climbing the tree using fine balance and skill, as he does. I think he'd prefer to see a climber develop the fine balance possessed by the tight rope walkers. It is probably a lot faster to climb that way, if you're able to acquire the skill. I just can't afford the downside risk of busting my body up.
Also, if you aren't aware of the "rope walker" climbing system, you should look up videos of it. It requires a foot ascender and a knee ascender. I think it might be much easier than foot locking.