I'll toss my 2c out on the table, as lack of solutions will always be edgy.
How to big factories do it uniformly? Massive inventory, maintained for years, bulk buys from dedicated suppliers, and a secondary chain for anything not suitable for the primary focus product.
And that, will be a far cry from an expert of reknown who rolls a limited amount for a stable of clients. He also has extensive inventory, and has associates he can purchase specific top quality tobacco leaf from, well in advance.
As your skill improves, your patience will also.
Your best bet is to listen to suggestions, yet buy on advice from Don, or any vendor who will appraise each lot offered for sale. It will take a personal relationship, and a substantial inventory to develop the end product you desire.
Good luck
rc