Drop Stitch Pattern Sampler Afghan Square

[38sts x 60 rows]; This knitted up way too narrow and much too tall. It's very springy like ribbing and loose too.
Fix = [48 x 54]

Pattern: Drop Stitch Pattern

Begin each row with SL1pw, P1, K1, work pattern row, K1, P2

CO 42
Work pattern rows 1-12  four times as indicated above, then rows 1-6 once.
BO purlwise.