Warning--leaving the presser foot up while sewing will not work because raising the presser foot releases the tension!!! You'll likely end up with a huge knot of thread to remove and possibly damaged fabric.
Fine fabrics present some issues for most machines but there are several things you can do to alleviate or even eliminate issues.
Be sure to use lightweight needles for knits (ball point). Use a good quality fine thread. Loosening the tension will help alleviate some of the puckering. In addition, using a wash-away stabilizer to add body to the fabric will help with puckering. (Even using paper under the fabric will be enough to remove puckering--however, it tends to dull the needle faster than usual--but a new needle is an inexpensive solution to an age-old problem. Also, using a roller foot, teflon foot, or walking foot may be beneficial in feeding the fabric. Some people will starch the fabric to add body.
Seam Puckering Industrial Sewing Thread Tension Coats Industrial
How to Prevent Puckering Sewing Machine
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Perfect Machine Tension Every Time Threads
Leave the tension foot up and self feed very slowly
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