Had transmission rebuilt and did a relearn on it and it still shifts hard in 1st

Owner: Have some qualified to do so check the CVI Index readings with a good scan tool, these readings may give insight as to why the transaxle is giving you this symptom, possible incorrect clutch pack clearance, missing or out of position wave plate, incorrectly installed accumulator spring, excess final drive lash, failed engine mount, worn axle(s), or control solenoid issue.