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You should weed between the rosebushes but I would use one of those surface skimmer type hoes. You can go down 3/4 to 1 inch and wack the weeds off just below the surface of the soils that way and not get into the feeder roots too badly. Going deeper could damage the upper feeder roots too much. They will tolerate a little intrusion without any real harm. Another thing that can be done is to trim the weeds down to about 3 inches tall. Then using a foam brush for painting with some weed killer in it, brush over the surface of the weeds going one direction and back again. The overspray problem with spraying is eliminated and the weeds get taken care of.

The main thing is to monitor the watering so they do not get watered to the point of soaking wet mud and even standing water. Also, be sure they do not get watered with the overhead system in the hotter parts of the day. The water droplets on the foliage will act like a magnifying glass and cause burns on the foliage. Some folks say never to get the foliage wet and never to water at night either. The main point is to give the roses some sunlight hours to dry off a bit before total nightfall, if at all possible. Check out this article for additional information about watering your roses. Here is a link for you: https://www.gardeningknowhow.com/ornamental/flowers/roses/watering-roses.htm

There are many things that can cause this. This article will help:
https://www.gardeningknowhow.com/ornamental/flowers/roses/yellow-rose-leaves.htm

Unfortunately the Ivy has a very strong tendancy to choke most anything else out. The only way that you may have some success is if you trim the ivy back and keep it separated as much as possible from the locations of the climbing roses. This can be extremely difficult to do though as the ivy will continually try to wind in and around the rose canes, which will choke the canes and their foliage eventually. The best mix with climbing roses I have seen is Clematis as the two seem to get along well together. Hardy climbers such as one named America and one named Awakening might give the ivy a run for its money. I fear they too would eventually lose out though.

It could be that the roses are in the shade too much and do not get enough sun to perform well. Perhaps digging them up and moving them to a location where they will get 6 or more hours of sun per day is what they need. If they are fully leafed out and actively growing now, this is not the time to move them. Wait until next early spring and move them.

It could also be that they need a little rose food to get them to bloom better. The chemical mix fertilizer called Vigoro Rose Food that they have at Home Depot is a good food for them. Also, you might want to look for an organic rose food mix and alternate between the two of them.

Starting a rose from a cutting isn't as easy as it sounds. Some foks seen to have a knack for it. I'm not one of them.
I have better luck with layering. Take one of the long canes and pin it to the ground. Cover the pinned area with soil and keep it well watered. You'll see roots the following year. I usually leave the new rose in its original spot for another six months just to be sure I've got a decent root ball and I move it keeping as much original soil as I can.