Blackstrap its thick, and viscous texture can make it hard to work with, it has a higher nutrient content than regular molasses, but tbh that's not why we use it. Blackstrap molasses actually has less sugar than regular molasses because it's a more concentrated byproduct of sugar production, with most of the sugar extracted during the multiple boiling processes needed to create it.
I recommend powered cane mollases as it's water soluble and has highest amount of sucrose of any nature's sugars, sucrose is readily available for root uptake and ready for transport within the plant.
Most other "sweetners" are primarily glucose which needs to be broken down first. Glucose is more a signalling sugar and should be kept put of medium until flower starts or risk delaying floral development similar to having too much nitrogen during flower.
The blackstrap syrup will become a breeding ground for bacteria in the soil unless watered down which can be a finicky to stir well.
Gluck.