Big Jim
I have footed the Kenetic 300's but have not found a shaft that foots the .200 exactly.
The best Find is a brass tube from the hardware store. That fits exact on the .200 but is a bit thicker wall then the alu shafts but works great.
The Fit must be tight, I do not like to have any play at all!. I use 24 hour epoxy for my footings.
We have experimented with loads of arrows as my buddys and I foot all our arrows, have done for years. Especially with the HIT as you described, the new Goldtip inserts are very weak! So i also use the HIT inserts.
if you have to build up to make up room for a slightly loose footing the best thing to use is masking tape, rolled on tight. but it a bit finicky to get right.