Puff Embroidery on Barudan

SIGNEX

We have a 6 head 2002 BEDYHE-ZQ that we recently acquired, Its sews flats and hats great, But when I try to sew a puff design on cap, It has severe birdnesting in bobbin area,When it does sew , you can not see any bobbin thread on back side no matter how loose bobbin is,

Do I need to make any mechanical adjustments to machine before sewing puff,
raise presser foot height etc.

We have a couple of single heads , toyota and happy, the design sews fine on,

any input would be appreciated, This is first barudan I've had and not to familiar with them,

thanks mark

ayugup

Although I'm not a technician, The problem can be the needle is not big enough( titanium Sharp needle and 80/12) or there a problem with needle depth Gauge