Hi @ricercar & @Patrick_Van_Deursen,
By the end of the week we ship an update to the Beta version of the Mobile App which might influence the amount of device tiles you will see. 
We build in a new mechanism which let the device tiles scale based on the set font-size of the mobile. This works both ways: if you have a smaller font, than you see more devices tiles, if you have a larger font you will see less device tiles.
I am curious if this update makes your situation any better. Please let me know! 
