I have been racing off road 5 weeks straight due to work schedule. Gave me time to work on my setup some more, the car works well, but to me it has a small push on power and slow rotation in the middle of the turn. Note: only in the stock class 17.5 non timing, in mod the car works fine. I think because of the speed and momentum. I have tried all the the different set up angles and positions the car allows without extending the chassis. I believe that modifing the car structure and making parts fit from other manufactures other then springs is not in the best interest for Tamiya and their customers. Small modifications using Tamiya parts are fine, because a customer may not buy a kit due to all the modification they see done and believe they need to do so the car works, in the other hand, small modifications using Tamiya parts can be seen as hop-ups or as replacement part when their original parts wear out. They do not need special tools or pay to get them done.

Sorry, (off track for a minute) back to the CVD mod. I came to this conclusion after looking at a B4 and noticing that their CVD had a retainer over the pin and no set screw. I know the TRF714 and TRF801 have the same design, on the 417 not having set screw in the CVD makes a big and noticeable difference in steering, with the set screw the car pushes going in chaters in the middle and pushes out the turn, with out the set screw chattering is eliminated car rotates free and no more push, I belive it has the same effect on the TRF201.
You will need Tamiya parts 51444 TRF cross joint set, 54016 DB01 assembly universal shaft (rear), drill and a dremmil with a cutting wheel.

Step 1: Chuck the axle on the drill, spining it slowly, take the dremmil and scare a straight line across the pin holes of the axle as shown in the picture. Note: you do not need to cut, just scare the metal to hold the retainer.

Step 2: Test fit retainer, make sure it does not move left or right from the pin holes.

Step 3: Assemble the universal.

Step 4: Install on TRF 201

I have practiced and raced with this CVD five times, twice in mod and three times in stock with no problems. In stock my lap times improved by two tenths and 90% of my push is gone.