They weren't "root aphids".......Just by looking at your plant. I can tell you without a doubt - It was not Root Aphids!
If you had root aphids as bad as you describe. The plant would have been yellowing and looked rather unhealthy.
Your plant looks pretty damn ok. In fact it looks very nice!
Even if it was (not) root aphids, at the point your plant is at. You could have run it to finish with no problem.
If your using organic feeds, your feeding the bio heard already. The "need" for molasses is moot. But go ahead and do what makes you feel better. Again, the use of a simple bio tea would serve you far, far better....