your swim anim goes like: \/\
the normal esf ones: ---
im dont mean to say that it looks bad, i like it alot aswell, but it will look pretty wrong ingame, since the \/\ movment is mostly only when you swim pretty fast, but ingame you swim pretty slow.
for the "need more movment" ideas i explain it like that:
some people move like a turtle... slowly moving, and not bothering to jump or else... just doing minimum activity
but there are some people like geopards , fast, very active and who dont bother to move their bones till their maximum, since they know it will bring back more power.
(moving their legs,arms, back, and so on)
http://youtube.com/watch?v=OiXDkNDLoy4 (bad example but it shows that his movments from one position to another one are not taking so long)
good example:
http://youtube.com/watch?v=WoftISd7HJg&mode=related&search=
just make the moves abit more rushed/actionfilled