If you buy from somewhere that is not extremely shady (like aliexpress in china) you probably get f1 seed that is produced by the breeding company (or some contractor, certainly not the seller, the 'formula' for that specific f1 is highly secret). If seeds are old Because they didn't sell, it's the seller's fault, and they will germinate poorly.
Getting long trusses is largely dependant of pruning to 1-2 stems. Most cherry/grape hybrids can get them. Try Sakura F1 for 1m+ long trusses. Tomatoberry can get very long trusses also (60-70cm).
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