Back on topic.
I aim to always (regardless of speed) accelerate at around 80% load and keep rpms under 3000. With variations (rpm especially) from engine to engine, it is the most efficient way to accelerate, period. TPS doesn't really have much to do with it other than it effects load. One TPS reading will not work for everyone and will vary quite a large amount depending on many things. Load is the key.
I think there are benefit of accelerating slower. It allows you to not over-accelerate since you have more time to think and see what is going on. It also lowers average speed which will lead to small gains.