I have only raised chicks with a broody hen [no incubator].
The chicks have no problems following mum down the ramp in the morning but no matter how much she jumps up and down at the top of the ramp at bed time calling them, they have no idea how to get back up the ramp and for the first week or so, I give them an ‘air lift’ until they figure it out
Me? I would leave the food and water in the run and as you have been, cave and put them down manually if they have not worked it out. If you put the food and water in the coop they might be less inclined to want to come out unless, as suggested, boredom kicks in.
I agree that your ramp may be a little on the steep side and as suggested, maybe some ‘rest points’ [logs etc] underneath may encourage them. When I have little ones, I put a ‘table like’ structure behind the ramp in case one should fall, the drop is not so far and also gives them somewhere to ‘hang out’ so rather than just being a way up and down from the coop, it kinda doubles as a place to hang out/perch etc which makes the ramp more inviting than just a way in and out .. I hope that makes sense
If you are concerned that they are not going to go back into the coop during the day when it might be a little cold etc; until they have worked it out, maybe try and construct something temporary for them under the coop or in the run to get out of the wind/weather.
Persevere with helping them if you think they need it and they will work it out.