I am still trying to validate this option of H-1 1 year extn before 6 year max out, but here is what I found from my research.
H-1, 1 year extn can be applied if
a. The perm was applied before the 6th year of H-1, the 365 day rule. This is irrespective of I-140.
b. If the perm was applied in the 6th year, can apply for H-1 1 year extn if you have the I-140 applied receipt.
c. Can apply for H-1 3 year extn if your I-140 is approved.
This option b to apply for H-1 1 year extn with out I-140 approval can be found in the I-140 forums where folks had audits on their I-140's.
BTW, Vadlamani congratulations!!