Advice?

I started the CG method the Friday almost two weeks ago, and I did my final wash then, and since I have only washed with a CG approved conditioner (about every 2-3 days) that’s very light and not too moisturizing. I still found that after about 6-8 days my hair started going limp and my curl/wave pattern started disappearing and my hair got heavy. It’s not exactly greasy, just really.. heavy? but kinda greasy? Even though I scrub/massage the conditioner in for a solid 4-5 minutes in the shower, and the hair does feel clean when I get out, but it just goes downhill from there. This morning I had to wash with shampoo (it only had a little bit of sulfates in it, no silicones or drying alcohols) as I was going to get my hair trimmed and washing your hair with actual shampoo is a requirement from the salon due to the pandemic. After washing it my hair INSTANTLY got curlier/wavier and lighter (until it was brushed at the salon, that is 🙄). Should I find a co-wash I can use regularly to combat the issue with my hair getting heavy, or could it be some sort of reaction due to the change in my routine?