Hard boil is a must for the jelly or jams to set well. I had to do a small batch over years back and re cook it.
I like thick jam not syrupy ice cream type topping. The flavor is still good but the texture is missing. Some I keep for ice cream but really love the heavy paste type jams.
Just like I prefer my lures.
It is best to over cook a batch then under cook it. If it isn't setting pretty quick when putting it in your jars then it won't get much better after it cools.
I could make some fine jam from those cherries. I much prefer jams. It is a shame to waste the whole cherry for some juice squeezings.