I think Few: 2-3, Couple 4-6, Several
7+. What are your thoughts?
Definitely not. Couple is certainly fewer than few.
Pair: Two which go together, a matching couple.
Couple: Often used with roughly the same definition as pair, with some specific idioms, such as the happy couple (newlyweds). Sometimes used just to mean two, any two, not necessarily a pair. Sometimes, informally, used to mean few.
Few: A smallish group. There were a few washers in the bottom of the screw drawer.
Very few: A small number, smaller than expected. More than two, though.
Few enough: A small group, probably but not necessarily smaller than expected. Still more than two. "So was it a big crowd?" "Nah, there were few enough of us."
Quite a few: Several, more than expected. There were quite a few people at the party. It was a fair[-sized] crowd.
Several: A large number, but not necessarily larger than expected.
I'd rarely use the word few on its own. It would almost always be very few or quite a few.
For what it's worth, I'm Irish, with English parents, and listen to more BBC Radio 4 than anything else.