The issue you're experiencing with your 44" Irvine Slow Rise blackout blind is due to the internal spring mechanism losing its ability to hold proper tension, a common wear problem especially in larger blinds. Both the medium and large replacement springs you tried are not resolving the issue because the correct spring size for most blackout Slow Rise shades of this width is the 1.25" (1 1/4") diameter spring. You should order the Irvine Replacement Spring with a 1.25" tube diameter, selecting the medium size option (18.5" total length) suitable for shades 30-59" wide. This spring is designed to maintain proper tension and slow-rise function. Installation is straightforward and supported by instructional videos on the product page. Measuring your existing spring's tube diameter can confirm this choice. Returning the incorrect springs and ordering this specific 1.25" medium spring will likely solve the tension and retraction issues with your blind.