Hi and welcome! Hey, 26lbs isn't much over breed standard and breed standard is only really a guideline for show dogs in particular. And, it is I think far healthier for an individual dog to come in at the higher end than be way below the breed standard -- smaller dogs are the ones with more potential health issues related to small size (health problems can cause smaller size). Also if you talk to breeders, many have male stud dogs a bit above the breed standard -- many feel the breed weight standard might be due a review.
Anyway: regarding ears, there are a couple of things to consider. Dogs with hanging ears can be more prone to infections and your vet or a groomer can gently shave away the hair around the opening of the ear and trim back hair on the inside of the ear flap, to let more air circulate. You can also get a gentle antiseptic vet standard ear rinse and clean ears regularly and gently (have your vet show you how to do this effectively and safely -- never put cotton swabs in, for example
).
Vets should also be sure the issue is infections and not, say, ear mites, which can be terribly itchy.
Also, your vet and you should be aware of syringomyelia, a neurological condition that unfortunately, affects a large number of this breed. Often the discomfort causes dogs to scratch at their ears and vets can misdiagnose this as ear infections for years. The same goes for PSOM, also common in the breed, a form of glue ear.
You can get more info on these conditions at:
www.cavaliermatters.org
www.cavalierhealth.org
www.smcavaliers.com
and in the Library section in the health division here on the board. Hope that all helps! Others I am sure might have some suggestions too