Suction line freezes at the condensing unit at 28 degrees.

The outlet of the evaporator was 34 degrees.

Evaporator was in an attic with about a 30 foot drop.

It has two ton drive with a three ton condensing unit. Fixed restrictor.

The only thing I can figure out is the coil is over feeding and flashing close/at the condensing unit.

EXCEPT, for the obvious install a three ton drive.