I use a RTP and kick in after getting up. In terms of foot placement within a RTP, my understanding is that you should get your foot jammed into the RTP pretty much as far as it can go. Is that correct?
Then in terms of sizing of the RTP, and placement of the strap, what's the goal there? To make it specific, here is my foot in my detached RTP, and I feel like this is usually about where I get it while skiing:

Does that look correct? I think the overall sizing is good, but the front of my toes actually go past the end of the padding a little bit. I'm wondering if I should move the strap back one hole so my toes stay on the padding?
just for reference, I am 10.5 US size shoe, and that's a large D3 Contour RTP.
Comments
The bottom line is that "as close as you can get" may not be best. It's yet another variable worthy of experimenting with.
I did move the strap back one and at least on dry land I like it better. I can still get my toes to the edge, and my foot feels more secure with the strap farther up my foot.
I might have a different problem though, with ripped screw holes in the rubber. But to keep to this thread on topic, I made a new one for that here.
Been moving the straps back one hole (that i had to drill) for 15 years.
Way better and more solid connection to the ski then when the strap is on the front of foot like in pic.
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spread will give him 19 3/4 to the tail. That’s a lot more tail to control.
Second, John, I think it would be impossible to achieve a 12” spread on a size 14 foot, don’t you? So that’s a silly question.
But a 185 pound skier with size 8 feet on a 67 or 68 inch ski would be overwhelmed by the tail of the ski if that person had, say a 10” spread and 19.75” off the tail vs a 12” spread and 17.75 off the tail. That’s about 10% more tail of the ski with which to contend. Or even an 11” spread and 18.5 off the tail or a 5% longer tail. The distance between the back heel and the tail of the ski is an important consideration.
Obviously, in fine tuning your set up, you have to account for the ski’s teeter totter point between the feet and maybe 11 3/4 or 11 1/2 will work better for you (or maybe a different tail on a DV8 can do the trick) but if you want ball park “where do I start” advice on binding set up, and assuming you are a normal male skier of normal proportions, start at a 12” spread between your heels and work from there.
You could suggest that the solution for our skier with size 8 feet on a 67” is a 10” spread and moving the front binder back two inches. Well, try it. If it works, great. If it doesn’t you are back to square one. (Spoiler alert: It won’t work well. You are no longer standing on the sweet spot of the ski.)
But toes touching the front heel is how they taught it 50 years ago. Maybe that still works?