when should i flip???? will i get big yeild if flip now

It depends what you consider a big yield?

If i were you i would let them veg a couple weeks longer, fill the tent a bit more then flip the switch. Atleast you will maximise your potential if you fill the tent.

But don't forget they will stretch during the first 2 weeks of flower so don't overfill the tent or you will have problems.

i would do it now ,cos when you flip them ,its gonnae get cramped in there pal...

I giv them couple days they only been in the 10ltr pots 5 days or so if that

the longer you veg the bigger the yeild in most cases. In my opinion though, you should cut your plant count down. ITs gonna get crowded in there, and plants need room to grow. I actually increased my yield by decreasing the number of plants i had. I had pretty much the same size tent and i yielded 6 more ounces by dropping my plant count from 6 to 4. iam not saying that this will happen for everyone, but i do know the plants grow bigger and better when they arent crowded.

I have been cutting lower weak growth off I will tie all down again this weekend and flip to 12/12

Waiting till this next weekend is probably a good idea. I would also trim them up underneath and try and create a flat canopy in the room with no undergrowth. Could put in a trellis and use that to spread them out flat, scrog style. Will give you the best potential yield for your current setup I think.

I won't be to get in and round them under trelus m8 I tried with 4 plants in 3x3 space and that was cramp

Just like bertiswho, I too have increased my yeilds with less plants. Bigger plants = bigger yeilds.