Looking for advice on pulling hitch

Last year was my first year pulling the d19 and it did pretty well. I used the stock drawbar and mount but I shortened the drawbar so that I could put a Cleviis right behind the stock drawbar support. Crued but I works.   Doing this helped but I am still 26-27 inches behind the axle centerline and its not that easy to adjust up and down to get between the 18" and 20" drawbar height differences at some of the local pulls. If I use the pins in the drawbar support it is fine at 18" but it is too high in the next position for 20"

So I am looking for some advice as to hitch ideas and also opinions on whether it is better or worse too get to close to the rear axle.   Will I get to the point where it will hurt performance and not help?    I was thinking of taking off the stock drawbar support and making a mount that goes straight down from the back of the rearend and shorten things up the there.   And then fab some way to adjust it up and down.      Just so everyone knows I pull in the 7000-8500 farm stock classes usually paced at a top speed of 5 mph.

Here is a picture of what I have now. I pulled last night and the tractor ran great but I was run over by a lot of other tractors. I do think a d19 diesel won the class so that's a good note.

You need to cut that angle iron above the drawbar and raise it up. Then use shims or long threaded bolts to raise/lower the drawbar to the height you want it to be. Anytime you can shorten the drawbar to the minimum length (usually 18 inches from center of the rear wheels) the tractor will generally perform better as lone as you can balance it with it that short.

Make it all adjustable but so it can lock in place too, found out with a 180 that some tracks a longer hitch point preformed better