I will try to answer your questions. However, I am not clear about about your dance goals (i.e. social, competitive, both?).
Originally posted by weimdance:
Do you feel there is an optimum ratio between instruction and practice in this type of social setting where you really do have to dance with all levels of dancers.
While it is easy say that more practice is always better, the question you should ask yourself is what more can I do to practice? Without a regular partner, you are limited to practicing at socials, practicing alone and practicing with your instructor during lessons.
What are the pros and cons of introducing interantional along side the American.
The way I would look at deciding between American and International styles is: "when in Rome ... do as the Romans." If social dancing is important to you and most (if not all) of the people you dance with dance American style, then who will you dance standard with?
However, for competitive dancing, standard is good training for smooth. You shouldn't have problems adding standard if you understand its limitations in a social setting and that you may not be able to lead partners, unfamiliar with standard figures, through some of the figures.
Since there are many similarities between standard and smooth, I wouldn't worry to much about spreading yourself too thin. If you don't include quickstep, every figure in standard can be danced in smooth (at some level). Why not take the time you are dedicating to smooth, and split it between smooth and standard. Use the standard to improve your technique.
Blair