I'll assume it's me...and then if it isn't, I'll just bow out.
My strength hasn't dropped much at all aside from some exercises where I think being heavier helped out...like dips on the hs machine. Other than minor changes like that, no, my strength is only slightly affected by the less calories and carbs lately. Before I dropped carbs more though a couple of weeks back, I was actually seeing an increase.
As far as energy levels, once again, I am feeling it today because I have been in meetings all day and I haven't eaten. If I don't get the food in, this may affect whether I train this afternoon or not. Before maybe this week (due to added stress) I wasn't seeing a decrease in energy.
I am not sure what you mean specifically by complexes, but I move to about 2-3 different movements at a time in between sets. I have found it aids in fat loss especially since I am really trying to keep real cardio to a minimum.
I am using more free weights lately (like dumbbell curls, kickbacks, deadlifts) but I still rely heavily on machines.
My energy levels are only affected when I drastically drop calories.
I have also found over and over again that if I notice a decrease in fat loss...a cheat day usually means I will see more of a drop in my waist by later in the week.
I am alternating the amounts of my food intake over the week trying to go more by feel.