driver,
the reason you're still getting the red dots is because you're exerting an excessive amount of force when you squeeze your cock. In order to gain girth, which is where you're seeing gains when you see red dots, you have to exceed the level of pressure exerted since the last time or at least within the last week or so.
You are definitely doing something right. Just be careful of sharp pains because this can be the urethra being pinched...go by feel and if it feels painful, back off a tad.
BTW, when I do uli's, my cock feels like it's gonna split underneath. Also, my cock is covered in red dots as we speak...so cool.