Just my recommendation to get you the end result you are looking for:
1) Find kit recipes you like at Northern/MoreBeer/etc - they have the recipes as PDFs
2) Add the specialty malts, hops, yeast to your cart (just omit the base malts)
3) Enjoy brew day!
Might be interested in this thread Homebrew Talk 3D Print Thread.
I have a good amount of 3D printed parts around my brew system and workshop, but nothing that touches wort.
Did you measure how much you are actually leaving behind?
I'd be wary of trying to get too far down to the bottom and sucking all of that trub into the plate chiller. My side pick-up leaves about 1/3 gallon hop/protein/wort trub in my keggle, which works out pretty well since I don't use a...
It sounds like your volume into the boil kettle is low - is that correct.
IMO, you have a few options:
a) additional sparge of the missing volume, then more wort into the BK
b) additional water into the boil kettle (treat for chlorine/chloramine if needed)
c) reduce boil viggor to reduce boil...
Drag, I like the idea of it, and was hoping to get one to try, then the recall started. Hopefully it is something fixable and they come on market again...