I am stitching on 18 count Aida and using 4/5 strands of floss for half cross using #26 needle, is there a better choice. This is a kit and needles keep breaking at eyes.
I would say that 4/5 strands through a size 26 needle is too much. If you need that many strands for coverage using half cross stitch I would suggest trying out a size 24 tapestry needle. This will be thicker and the eye will be stronger. It should still go through the holes in the Aida 18 fabric without enlarging them.
You can find more information about embroidery needles by clicking on the link.