If you set the AP brain to max responsiveness (going thru the available lower levels) and she is still not playing along then the drive may be not up to the job. But if you can steer easily by hand in same conditions then any properly sized drive will be up to the job.
Crawl into the drive place and read its markings then look up on Jeffa's if the drive is man enough:
Autopilot drive units
For iffy conditions you want a drive that is OVERSIZE for the boat. I like the full laden condition not to be below 2/3rds of the quoted max boat size. I use displacement
rather than length to judge this.
Next step check in your Simrad AP if the brain is expected to co-op with the jeffa drive you have. Check what components there are on the Sim side. A "G" (acceleration) sensor helps in many cases. (Note: I do not know how Simrad implements G sensors).
Otherwise it is in the in-port config then the sea-trial config and the AP should be able to provide decent steering in all but hell break open conditions.