What size thread are you using? For Perle #8 I use chenille needles. For Perle #12 or 12 wt thread on spool I use Thimblelady XL which are similar to sashiko needles. You want something very sharp and thin with a big enough eye for your thread. You might try several out and find what suits you best. I tried a bunch and Thimblelady is my favorite.