Learn English – word for “flashbacks within flashbacks”

Not really - you already have two conflicting answers, and I would have said Entry myself.

A cache is just a container, and doesn't say much about what you put inside. Would you expect a common term for things in a bag?

If you have to refer to the items stored in the cache without describing (or repeating) their type, pick one of entry, value, item or similar, and just stick with it. It'll be clear enough.

Are we forgetting how we

rate the potency of this coffee?

the power of something to influence or make an impression.

stimulation resulting in an energizing effect on the person and/or his/her body and mind would be the impression or influence the substance in question has. This seems most appropriate of a word for what is essentially a drug. It is a clinical term as well as in my impression, pop culture lingo.

In short, potency packs the most oomph for a single word to describe what your trying to say without "izingness"ing us up yet another dictionary word.

• edit: also potency is appropriate when we are actually objectively asking someone about the coffee, the individual asked would then default to which aspect of the coffee is important and most apparent to them to answer as to the flavors effect or its neurological impact or both.