I thought I would give an update. As stated, I broke two of the rubber universals with the stock EJB tiller. While fine for a dingy, it was not meant for the weather helm of a 27' boat. I went with both the 900 EA and 1200 EJ and I'm happy with both tillers. Ordered from England and got a good price even with shipping to the USA. I use the 900 EA when it is windy and I expect to have weather helm and use the 1200 EJ otherwise. I meant to install last fall but when I went to the boat to drill the required1/2" hole, I noticed that the screw holes would not align because the EJB mount used slotted holes, which resulted in the holes being too close together for the EA/EJ mount. This was a fortunate event because given more time, I realized that I needed to relocate the mounting location if I wanted to use the tiller extension clip. I ended up about 13/16" further aft, which gives me less than 1/16" gap between the tiller and tiller extension when stored in the clip. I believe I could have gotten away with 11/16", but because of the 1/2" tiller plug, it's not easy getting an accurate measurement if the bend of the tiller is going to interfere with using the clip. The clip was positioned for the EA 900, which also works for the EJ 1200.
Additionally, since I had the tiller in the basement, I removed some of the foam from around the 1/2" hole I had drilled into the tiller (all the way to the underside) and filled the entire hole with glass clippings and resin. To save a little resin I inserted a 7/16 dowel and inserted that where the universal plug would go. Afterwards, I redrilled my 1/2" hole. This should keep the universal solidly in place and prevent possible rotation of the universal.
I did notice that I'm getting some failures with the tiller clearcoat. My thought is maybe the tiller is made with epoxy and the final clearcoat(s) is polyester. Clearly (couldn't help myself), something went wrong in the manufacturing of the tiller.
One last thing, I used a sanding drum/band with my dremel to modify the rubber stop on the tiller universal so I can use the clip. Here are pictures of the modification (can also see the filled in EJB screw hole) and the EA tiller ext. in its clip: