Ok, thanks for your answers. I'll give it some others try later (not i didn't succeed before). In fact i got nice clouds and much "easier" cause of the filtration. But what i could see from the window was telling me that the t° was getting even much more higher.
Something else, now : My spacer finally broke... I can see that the way i'm setting it in place now, it doesn't fit tight around the chamber (there is a fine space open to fixed screen). Because of tricky removing, etc...my screens are bent now.
Anybody has another option to get it in original form? Or close? I tried to bent it slightly in the other way (as adviced), but then it got just worst and worst. Also broken spacer is the cause problem : the screen doesn't stay flat anymore and cause light bending.
So i plan to try and use only stock FV batteries untill new spacer will be at home !
Otherwise the flashvapebomb is my best compagnion for outdoor trips atm! A small banana-bag or something like maybe the trick for summer!
Also have to say that once the ritual and tools/technic is pass, the cleaning and reassembly process isn't a pain! Just use patience.