@george1421 thank you for your responses. The timeout is fine the way it is, as long as I understand how it functions. Just need to turn it up while I join 100 clients to it. ;-) Though, since you say it’s probably a layer 8 problem on the group based multicast, I’ll try to find the time to run a few experiments on my side and see if it’s now working. I have a fairly simple network (air gaped single subnet educational lab), so that shouldn’t be the issue.
The repeating multicast would be handy but, as you say, there are certainly potential issues there as well. Again, as long as I understand the mechanic I can work with it! Thanks again for your answers(and all your help in the past as well).