Listen internally to your body and mind.
There is a reason why you are 'thinking about it' and you should follow what best feels right to you. Those reasons are only known by you.
Remember that activation is not necessarily a one pass thing. Activation in multiple passes is what really builds comprehension.
You'll find with each successive pass, that the material will become second nature and as you make each pass, the passes will become shorter and shorter as you filter out what you already know.
Try this out. Stick to one chapter tonight. Now Keep your activation session to less than 30 minutes. Now, Skitter/Dip/Superread,Rapid read, whatever you feel like doing. But Activate the same chapter a few times (like lets say 5 or more times) but still adhering to the time limit.
Watch and feel what happens. This is what is meant by learning in layers and it is one of the fastest way's of proving just how learning takes place so quickly and how one begins to build comprehension.
You'll also find that your thinking about it will diminish as you start to anchor information into the mind.
One does not question what one knows!