Air Distribution

[62 Bowtie]

Question for you bag guru's How do you know your air is distributing evenly?I dont have guages, I know I know, but my problem is not ride height its more a uneven level. I have 2 Viair compressors accuair vu4 manifold with avs 7 button sw when i hit the center rear sw the left goes higher than the right the front is ok ss7's up front could it be the bags? i got the rears on CL RE8's maybe too big? Also 3/8 line cut to same length at rear and in front with manifold centrally located, thanks dudes