Sometimes it's best to use a custom title on a page instead of just using the product name, here's a knowledge base entry on how to use the CDSEO page title as the on-page title:
https://www.websitecm.com/support/index.php?_m=knowledgebase&_a=viewarticle&kbarticl eid=71
You can then modify your skin1/customer/dialog.tpl to use an <h1> around the title (If it's not using one already since it is the default in 4.3.1).