I like having telltails on the spinnaker. I have used them since the beginning of sailing a cat with a chute. At first they are a bit tricky to sail to, I will admit. If they do not harm you, in sailing, why not just keep them on? I think that as you get better at sailing with the kite you will find that you can get the telltails to work. Pay attention to your sailing now then in 6 months, see if I am right. Steering and sheeting are pretty critical to be in sync. If you are sailing with a crew it will take a bit to get used to each other. Just tell them what you are trying to accomplish.

Sounds like your telltails are in approximately the right location. If you do not mind experimenting, I was told to put more telltails than I need on a sail and go out sailing. Figure out which ones work with the trim adjustments then take the ones that do not work off. I know this takes a commitment of time but it may be worth it to you. If telltails are too confusing, or worrisome, to sail with...it is better to sail without them.

I feel that telltails will show the adjustment before the luff will.

Later,
Dan