@Byanyothername from many years of experience, you only want Sterling Silver as a budded plant. Own root will limp along and provide some flowers before it expires but it was never meant to be own root. It was selected and introduced with the added vigor a stronger root stock provided. It is also one which strongly benefits from limiting how many flowers it produces until it builds into a larger, stronger plant. I remember reading in old ARS annuals that research had shown it required 35 perfect leaves to create one perfect flower in their florist rose study. While I'm sure that isn't required for every variety in every situation, it does provide an idea of the foliage mass required to provide you with what you hope to grow. You will find weak growers like Sterling will develop into stronger, larger plants better if you don't let it produce every flower it wants to make. Pinching the bud and leaving the wood and foliage to generate more flowering shoots will feed the plant and cause it to grow faster, larger. Once you have a decent plant under the blooms, allowing them to form and open provide you with the enjoyment you hope from it. Then, when you prune, go easy on it as it doesn't like hard pruning. Some varieties are weeds which will explode back into huge, vigorous, productive plants even after being whacked severely. Sterling Silver isn't one of those.
