Hi Jamie
The problem with delegating your proxy is that that proxy holder has the final say on the poll vote for the EC nominations. On other matters you can ask them to vote a particular way.
So really, it comes down to a matter of trust with your nominated proxy. You can ask them to vote for a particular person, but they really don’t have to.
The best solution is for you to be there, or have a proxy you trust to do your bidding.
Hope this helps