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Ok, more complicated maths but it’s what I’ve got:
2X8: 74.75” span with 1335# load (74.75/84*1500) gives .152” deflection. Too much IMO
2X8 w/ narrowed opening: 66.75” span with 1192# load(66.75/84*1500) gives .097” deflection. Borderline IMO.
2X6 w/ extra leg: 51.25” span with 915# load (51.25/84*1500) gives .077” deflection. Best of those 3 options.
In truth, you may as well do a center leg at that point.
2X8: 74.75” span with 1335# load (74.75/84*1500) gives .152” deflection. Too much IMO
2X8 w/ narrowed opening: 66.75” span with 1192# load(66.75/84*1500) gives .097” deflection. Borderline IMO.
2X6 w/ extra leg: 51.25” span with 915# load (51.25/84*1500) gives .077” deflection. Best of those 3 options.
In truth, you may as well do a center leg at that point.