Just like scapular position may influence the quantity and quality of glenohumeral movement, the starting position of the pelvis may affect your lumbopelvic mobility.
If you have difficulty with toe touch, there are many reasons, the least of which for most people being "tight" hamstrings, the epidemic that never existed. Try checking your pelvic position, if you are in an anterior pelvic tilt, your hips are already flexed, and your posterior chain is probably facilitated. Both of these change the quantity and quality of the movement, limiting your toe touch.
If this rapidly improves your toe touch, great! If not, there are other strategies you can try like squeezing a ball between your inner thighs, activating your pelvic floor, exhalaing, and more.
Keeping it Eclectic...