  Single Transferable Vote (STV) elections are a principled approach to
electing multiple candidates in a single election. Each ballot has a starting
value of 1, and a candidate is elected if they gather a total vote value more
than a defined quota. Votes over the quota have their value reduced by a
transfer value so as to remove the quota, and are passed to the next candidate
on the ballot. Risk-limiting audits (RLAs) are a statistically sound approach
to election auditing which guarantees that failure to detect an error in the
result is bounded by a limit. A first approach to RLAs for 2-seat STV elections
has been defined. In this paper we show how we can improve this approach by
reasoning about lower bounds on transfer values, and how we can extend the
approach to partially audit an election, if the method does not support a full
audit.
