Agree with deadstroke and Renfro, I may spend more time planning a difficult shot or non-standard safe, but once I visualize and plan the shot the execution time is very similar.
Renfro, right there with you. Seems like we practice offensive shots all the time, especially for rotation games, and there are many drills to practice the common 1-rail and 2-rail routes straight across, back to center, up to the opposite end rail, etc. Think Earl just 2 stroking everything toward the next shot effortlessly.
Like you, I only have a few safes I can play with the same confidence, usually they require more precision. I try to simplify them somewhat by making a definite decision on which ball I'm going to control, CB or OB. That seems to free my mind and stroke somewhat and I tend to execute better. When I try and overcomplicate the shot and get too exact on the speed or english just seems like one or the other leaks out and leaves an opening for my opponent.
I have it on my list to work on more "standard" safes and add more standards to my repertoire, but unfortunately my list of things to work on is long and my time is short, so one day...
Scott