I've used deprenyl, hydergine, and DMAE before, and in massive dosages and found they are a waste of time as far as increasing athletic ability. They don't do much of anything for speed, reflexes, or energy production. Rate of Learning is kind of a subjective matter and hard to measure.
The only substances I've ever used that work are stimulants such as caffeine, ephedrine, Dex, Ritalin, Cylert, and epinephrine(adrenalin). Anabolic steroids have a very dramatic effect. Creatine works quite well, but I don't get the punch I got from it that I did when I was young. Procrit(EPO) is great for endurance.
I've always considered nootropics to be BS. They might help some old geezer with a senility problem but for the average Joe they're nothing more that an expensive placebo. They just make you think you're smarter.
If you really want to increase your rate of learning you need to lower the resistance in the neural synapses with chemicals, and I won't name them specifically, that have hallucenogenic properties.