Repeating cloud patterns and grey areas

this is most likely not a new subject.

 

A couple of questions on the subject issue:

 

1) Is there a way to avoid the repeating cloud patterns as seen in the shot ?

 

2) I find the dark grey areas in the clouds when seen from above to be quite unrealistic. I may see grey clouds looking at them from below, but usually not from above. I don't know if this is coming from something wrong in my set up, or if it is caused by the way FSX draws the clouds, or if it is related to the cloud set (the one in the shot is from FEX2, but it happens also using REX2) . If the answer is the last one, can someone suggest a cloud set which makes clouds appear mostly white when looked from above ?

 

Thanks