What I heard that Schulze actually said was that making your on tincture would be stronger than most anything you can buy but that did not include his stuff unless you use 99.9% organic bulks or fresh herbs like he does and unless you pack it to the top with herbs like he does and press it with a huge press.
His are the stronger you can buy..homemade (at least 50-50 herb to menstruum) is next best and a good brand like herbharm might be 3rd best.