Thank you. I was getting confused by the arguments for and against its use as I'm a little slow on the uptake! There were post recommending changes to agitation and some against it.
The reason I thought decreasing the initial agitation is due to the decreased development time. It seems like the shortened time, with the same initial agitation would give higher contrast, as it becomes a greater percentage of total time. I'm glad to hear that I shouldn't have to change things other than time. Thank you!