Experienced shooters will probably say "Duh" to this. I'm just over the one-year mark shooting longbows. I have two out of three that would never shoot where I wanted elevation wise. I was advised by others on this site (and the archery shop) to move my fingers down on the string. I had also heard to move the knock up. I shoot 3-under with a tab. With one bow I use one finger space between my index finger and nock. With another bow I have a tied nocking point about two inches below the arrow where I put my tab under. With either of these I still aim under what I want to hit. My anchor point is the same with all and is referenced off my index finger. The arrows are tuned to the bows.
Well, I just got a 4th bow and the first few shots were about like the other bows. Then, on a whim I used my same anchor point but I switched to my middle finger for reference (instead of index). Bingo - the arrows hit right where they are pointed on the 20-yard target. After this "revelation" I strung up the other bows and grabbed the appropriate arrows for each. Dang - with 3-under touching the nock they all shoot to point of aim now. What a simple adjustment that relieved a year of frustration. I am sure there will be more "revelations" to come as I continue.
I've also learned to disregard the DW to some extent. I spent quite a bit of time with the chronograph, mostly to check my consistency. What I found was interesting to me. I have the same exact weight arrows on 3 bows. My 45# has a lot of R/D and shoots 163 FPS. My 50# with slight R/D shoots just 1 FPS slower than the 45# bow on average (162 FPS). My 51.5# "D"-style bow shoots 158 FPS. So with the same arrows, my lowest DW bow shoots the fastest and my highest DW bow is the slowest. My 4th bow is a self-bow and it uses totally different arrows with its 40# DW, so it is not an apples to apples comparison, but it shoots 150 FPS with its appropriate arrows. All these are actual DW at my DL that I measured on scale. I now know the different limb designs among the longbows have a huge effect on arrow speed, moreso than the DW.