In my opinion, the best way to lower the point on distance when using 3 under with gap is the fixed crawl. This has been described in videos by Jimmy Blackmon, which you can find on YouTube, and most recently by Jason Westbrock in the Dec-Jan 2020 edition of Traditional Bowhunter. This is a refinement of string walking, without all the fuss. You decide where you want your point on to be. In my case, I decided 25 yards, and you experiment until you determine where you should hold the string in order to achieve that point on. My string looks like this:
I hold the string under the extended lower tied-on nock, and my point on is 25 yards. If I want to shoot 50 yard shots, I hold the string right under the arrow nock instead, and I get a 50 yard point on. I extend the tied on nock, rather than put a separate indicator for the 25 yard point on, because having a separate tied on indicator feels awkward when I want to hold the string under the arrow nock for longer shots. For distances from 15-30 yards, I place the arrow point slightly under or over point on, holding the string under the extended lower tied on nock. At 35 yards and above, I hold the string right under the arrow nock, and place the arrow point slightly under or over depending on the distance. Personally, I wouldn't take a hunting shot over 25 yards, but I like to practice at longer distances.
The problem with this is that it is not allowed for 3D competitions, so it is only useful for hunting. For 3D competitions, I always hold under the arrow nock, but I gap off the top of the strike plate. Normally, the top of my stock strike plate is about a 25 yard point on. If it isn't, you can either trim it or use whatever point on it turns out to be. 1” is allowed over the top of the arrow on the strike plate without violating most tournament rules. For distances beyond 30 yards, I gap off the arrow point rather than off the strike plate.
Of course, you can either shoot longer arrows or heavier arrows, but this reduces bow performance, which I don't like, so I don't do that.