Your beans look very nice.

From past experience, with your wide 19ft header, you'll leave plenty of beans on the bottom of the stem and likely shatter more when swathing and then picking up  . . . . .

You need to look for a flex header for your combine and travel to get it. Unless you plan to never plant soy's again - do it right to get all the crop you can. I'm not sure if a header off a 750 will fit on the 60's series , but here's a selection. You can search tractor house to find more. Traveling the USA, to get a header would be no big deal in this day and age. Most are under $2000 bucks and you'd pay for it with 2 bushels of beans saved.

http://www.tractorhouse.com/listings/farm-equipment/for-sale/list/category/300002/harvesters-headers-platform/manufacturer/massey-ferguson/model/1859

Good luck and who knows, if you get a flex head, maybe you'll pick up  a field to custom cut to help upgrade to a newer combine with more head selection ? That's an option also, get into a CaseIH rotary or a JD ?