There is a proposal (CIP) in the works to make it easy to direct the superfluous delegation through a shareable URI, to either a specific pool or suggested portfolio, e.g.:
web+cardano://stake?POOL1=0.50&POOL2=0.25&POOL3=0.25
Based on what I’ve seen even on saturated pools’ own Twitter pages this is something that would benefit pools both large and small. This would be a good time for SPOs and delegators to comment on this proposal so wallets & exchange integrations can someday soon accept such URIs: