Hi Hugh
I assume you are okay at riding waveboards, but not extremely experienced (yet) ?
The thing is, that Dirk is correct IMO, that when you are good at wavekitesurfing, you move the rear strap really far back.
I've had to mount new plugs on a few boards actually, because on thruster boards, the rear strap rear screw(s) has to be over the finbox and not forward of the finbox, on almost every board (except for a few narrower bigwaveboards with less rocker).
The better the rider, the more far back the strap (typically, of course there are some riding very different)
The front strap is the key here - you often want the front strap quite well forward (but not as far as strapless, as the strap gives the board a better balance in chop at higher speeds so not needed to stand fully as far forward)
Moving the strap one hole (one inch) further forward or rear, makes a huge impact on the overall board feel and behaviour, so I always use quite a long time to get it just right with a brand new board, both the front and rear strap - it is interesting and very important IMO
Wont use more time now to tell about the front strap "calibration"...
When going upwind, or riding flat waves or in light wind - you stand in front of the rear strap of course.
But for good normal waves, you use the strap.
Also, when going out through some heavy breakers, if no channel, you just step into the rear strap too - and then out again when out or in between waves if long period sets.
BUT, if someone is experienced on a TT and have never tried a waveboard (or surfed) before, I always advocate to learn strapless in small or no waves, and then move on to straps later.
Many dont want to ride strapless though, so here I tell them to start with the rear strap at the most forward position
This way it will be much easier to make the transition from TT to Waveboard, as they are ridden almost totally opposite: You control everything with your front foot and the board edges on a waveboard - on a TT you have pressure on the rear foot (and bent a bit), so very opposite.
As new (strapped) waveboard riders tend to make the board bounce, and they are in risk of getting their ancle twisted if standing in front of the rear strap - it works great to move the strap forward at first
The only downside is, that when you GET experience, and ride on the steep face and doing aggressive cutbacks perfectly timed in the curl - you want to be as far back as possible
So you get "grandma" cutbacks if the rear strap is too far forward - they dont feel (nor look) good
But it is MUCH easier to ride this way, for starters.
I think you are somewhere in between (I dont know, you dont write), that you can surf, but still not into the full power cutbacks that often ?
I might be wrong, but I think you should just mount the straps at the front plugs (well, now you have new plugs), and then you will discover after some time (or years), that you want to move the strap further and further back.
When you get the strap "trim" just right both front and rear - you'll actually find that you can ride almost all types of waves IN the straps feeling bullseye, but takes some time to "know how to"
Peter