OP tomatoes tend to be finicky in terms of fruit setting, especially beefsteak types, so I can see how an overly vegetative rootstock could be detrimental. The current star of tests is Emperador from R|Z, supposedly has a more generative nature while also being very vegetative, Maxifort is now considered an 'old' hybrid. The problem is one can only find it in bulk, at least here in Europe.
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