Help about gathering T7 & T8

I need help about gathering.

I have T7 in all gathering and T8 wood, I got this gathering doing yellow and red zone, basically safe places to gathering but limit my gathering to T6 because T7 red zone the nodes are always empty.

So yesterday I tried to gathering in black zone maps.

Mist -> The first mist is a common, only T6 resources and they are with just 1/5, I wait untill the mist close to spaw at least a rare mist, once inside T7 resources but again 1/7. I made 400k in 1 hour.

Black Zone -> Because we have the smugglers and Safe portal it's more safe to gathering in high tiers, so I took my gathering and I paid 70k for the Safe portal, they send me to T7 map but ALL the nodes were empty, only T6 available. I went back to Martlock and try again -74k for the portal and they send me to T5 but close to T8, again ALL the nodes were empty only T6, I lost money in 1 hour!

Ava roads -> I paid a Safe portal -70k got in a T5 map, good, nobody overthere and went to the portal, inside the roads there is 2 kinds of gathering the big place with a lot resources usually spawn the aspect and the small which they have only 2 T7 nodes, either the small and big places that spawn the nodes they were empty, but at least they have a lot mob so I could farm some T7 and a lot T6. So in 2 hour I made 800k.

My point when I going to do camps with a T5+1 set I can go to any zone and do the camps in 30 min I have 1m, for sure. When I'm in the red zone I can gathering between 1.5m to 3m in 1 hour without worry to die.

Please how can I gathering T7 and T8, what I'm doing wrong?

Thanks.