The most important time for chemical use is before the planting. A clean seed bed is critical. My guess is based on what you've stated, the stuff you planted in the first year after discing likely all got shaded out and died. It sounds like you did a better job of keeping it short last year with...
I would mow the switch to the dirt or close to it some time in April. This will allow you to carve out the area of switch exactly the way you desire for your bean planting. Then when the switch starts to germinate, hit it with gly. This should burn down and allow you to disc/till and plant beans...
I would leave the furthest outside ones standing as they are the likeliest to have cover. I'm sure the interior cedars with no sunlight have cast all their lower needles.
If broadcasting seed, I believe it is recommended to seed at 1.5 times the normal rate. I would personally explore all options before deciding to broadcast.
If you decide broadcasting is the only route, I would at a minimum cultipack it when the ground is thawed for better seed to soil contact.
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