Try and stay away from the 90 degree elbows. They will add a lot of friction that may exceed what you can correct with an extra return spring. EC's is too narrow to accept a nylon insert, and even if you could, the cable would saw through it.
If you plan on using EC's swivels on the stock Tilly tiller arm, prepare to have to drill it out. I like those swivels and use them on all of my two strokes, and some fours, but if you can get a GEM 1348 (iirc) it's a smaller swivel. Made for the KT100 set ups.
The straighter, the better. Also, you can solder balls, etc to your throttle and brake cables. PM me if you'd like to hear what has worked well for me.