Here's what I could find :
Frog a bog in July 2012 states
"The intex skimmer works great. It needs to be under water , with the blue ring floating. pushed As far to.the side wall as possible, and tilted so the ring is lower on the inbound side. "
Here is someone else's pics that show the white cup extra deep in the water and level with the water. When that skimmer starts kicking out away from the pool wall, it doesn't work well.( It may be trial & error, because mine used to work for a while, then start to suck air again)
I do not have the intex valves on my pool anymore. Another poster that sent you a pic with the new style intex valve with the air vent/ relief on it, which may also introduce air into the system. That may be something to look at.
I also read here (somewhere)that some remove the skimmer while swimming because splashing and waves cause that skimmer to suck air into the system.
I wouldn't, but I might disconnect the hose from the inlet ( inside the pool) to let it filter without skimming while swimming.
I still couldn't find the pic of someone who zip tied the skimmer tighter to the rail to keep it from angling up & away from the pool wall, which could work.In the pic above, the zip tie went from the bar on the left, that goes down in the water, to the screw section on the right, on the outside of the pool. What it did is tighten the skimmer in a better position, so wave action wouldn't let the whole contraption bob up & down.
Frog a bog in July 2012 states
"The intex skimmer works great. It needs to be under water , with the blue ring floating. pushed As far to.the side wall as possible, and tilted so the ring is lower on the inbound side. "
Here is someone else's pics that show the white cup extra deep in the water and level with the water. When that skimmer starts kicking out away from the pool wall, it doesn't work well.( It may be trial & error, because mine used to work for a while, then start to suck air again)

I do not have the intex valves on my pool anymore. Another poster that sent you a pic with the new style intex valve with the air vent/ relief on it, which may also introduce air into the system. That may be something to look at.
I also read here (somewhere)that some remove the skimmer while swimming because splashing and waves cause that skimmer to suck air into the system.
I wouldn't, but I might disconnect the hose from the inlet ( inside the pool) to let it filter without skimming while swimming.
I still couldn't find the pic of someone who zip tied the skimmer tighter to the rail to keep it from angling up & away from the pool wall, which could work.In the pic above, the zip tie went from the bar on the left, that goes down in the water, to the screw section on the right, on the outside of the pool. What it did is tighten the skimmer in a better position, so wave action wouldn't let the whole contraption bob up & down.