I know exactly what you mean----that is what my sorts look like and I am not sure if that is a great sort or not?
I too had trouble seeing sperm in the top layer but they were there in the middle and bottom after an hour in the incubator---not quite sure why they didn't make it all the way to the top-----that is where we are supposed to get all the fast Y swimmers and I feel like I am not getting the bulk of them----kwim?
I may just use the tiniest bit of the bottom layer (b/c I do think I see the x swimmer sthere---not sure if I am just wishing them there though
) if I feel like I am not getting a great sort---for that I only need to add about 1 drop of pure lime and it drops to 5---b/c it is so little when I add 2 drops it sometimes drops to below 4.5 and then it would be a waste.
I have not tried the SW yet, but plan to as maybe it will help the sort better but I am afraid of burning out the sperm----it is so hard to know what to do!!! I keep going back to that hole in a condom but really think SU is the way to go if I can get it to work!
Good luck to everybody!!!