HI W´
First, I bond the 25 mm DCF reinforcement strips in place. From experience, I know where the highest loads are likely to occur in the design.
Here you can clearly see that a reinforcement strip running from the lifter to the peak would be beneficial.

In the example shown above, the reinforcement strip runs along the entire rear centerline.
As the first layer, I bond a large patch made from the tarp material to the inside. This spreads the load over a larger area, but more importantly, it prevents stress cracks in the laminate film where it transitions to the inner reinforcement patch. (This is an aging effect that I observed on one of my first prototypes.)
This is especially important if the inner reinforcement patch is made from a heavier, stiffer material. During repeated packing, the tarp fabric tends to crease along the edges of the stiffer patch. Over time, this leads to localized wear of the laminate film at those points.
Depending on how much load this point is expected to carry, you can also apply three reinforcement patches, each progressively smaller than the previous one.

If I want to use the lifter as an interior attachment point, I first sew a small loop to the inside at the center of the load point. I initially secure it only with a simple "marking stitch" so that I can identify the exact attachment point from the outside. Once I triple-bar-tack the attachment from the outside, the inner loop is permanently secured at the same time.
Since webbing tends to wick water and transport it into the shelter, I have started experimenting with laminate straps instead of webbing for the lifter attachments on DCF tarps.

For this purpose, I cut strips of 102 g/m² woven DCF to the desired width. Each strip is folded once with the woven face inward and then stitched lengthwise to hold its shape.
Because the laminate film is now on the outside of the strap, seam tape adheres much more effectively than it does to the woven surface.