You are expecting something else, perhaps a colour change?
I think you might be trying too hard to not use muscle ... at this stage. What do you think?
Some arts I have trained in state that when you see "splotchy" red dots on the palms, that is ki manifesting itself (I have no opinion one way or the other and yield to those with greater expereince, at the very least I assume its more circulation). If you engage in some of the stuff talked about in the non-aikido forum, it may happen, but I can't state wether or not I expressed more "correct" movement or not when it occured.
I assume that is what the original poster was referring to.
As for moving with the center, you will probably get better discussion out of the non-aikido forum as well for specific exercises.