I am a MistyFuse convert. Thin as a spider's web. I use it almost exclusively. It adds virtually NO bulk, and holds tight.

http://www.pinkchalkstudio.com/blog/2008/04/15/why-use-a-topstitching-needle/

"Topstitching needles feature an extra large eye to accommodate thick thread. They also have an extra sharp point that allows the needle to penetrate easily through multiple layers. "

McKenna's patterns all seem to have lots of layers of fusible, and that is probably part of the problem. I'm still thinking that a larger needle would help. Just go up one size at a time until you get to one that works through the multiple layers and I think that a sharper point (top stitch) will work better than a ball point which has a more rounded tip.

I posted the question, so here are a few more bits of information: my fusible was steam a seam 2; the blocks are part of a wall quilt which is a collection of kits I bought on an Alaska trip. I need for the quilting to be consistent all over, or I'd just not quilt the problem block at all ( its a McKenna Ryan design).

I'm wondering if a ballpoint needle would work

Some fusibles are not intended to be quilted at all! Heat and Bond Ultra comes to mind.
http://www.joann.com/heat-n-bond-ultra-hold-iron-on-adhesive-17-x12-/prd49052/

You can try a heavier needle (90 top stitch) but be aware that it may leave holes in the fused fabric that will not close up.
The pressure of the presser foot should not have any bearing on the needle penetrating the fabric.

I am trying to machine quilt a block that has several layers of fused pieces. My machine is a Bernina 440. The initial problem is that I can't get it to stitch through this piece. I'm using a size 14 microtex needle, which is new, and cotton thread, top and bobbin. Any suggestion? What should the presser foot pressure be ?