One of the first issues is that you have two overlapping curves and have mixed up the points between them. Not a huge issue, but one that will throw you off.
SplPath_B11_B30 should only reference
AngleLine_A11_B11 (which isn’t available, probably because you made the curve before the line.) &
AngleLine_A16_B30 to set your beginning angles,
B30 as curve points, and
X9 as construction points. The biggest problem seems to be a misunderstanding (probably because I didn’t make it clear enough) of how to set the length relationships. (I’ve, for example, realized that what I call reference points should really be called construction points, to make things clearer.)
For each curve point, the first control point length should reference the line between the previous construction and curve points, and the second control point should reference the next construction and curve points. For example, in my screenshot, the
X35 point references
X3 for the first length, and
X4 for the second. When I went through your
B11_B30 curve, and set just the lengths properly, it went from this:
My advice is to redo your pattern from scratch, as it has a LOT of extraneous points that confuse things. Once you have all of your lines set up, then do your curves. You’ve got the gist of how I make smooth curves; you just need a little more practice to get it down pat. Bravo!