Kevin
As far as helping the hive with fewer bees, sounds like youāve done pretty much all you can. You got them some more bees, the queen is out and laying, and hopefully you are feeding them. While they may not have as many bees as youād like to start, it sounds like they have enough as long as everything goes well for the next 3 weeks or so, until those eggs she just laid become workers. Adding more bees at this point may not work if the ones in there have setup āshop.ā It could cause fighting and further disruptions. If you did add more, you would likely need to use a separate body and fram for the new ones, separated by newspaper to let them get used to eachother slowly.
Key things for starting a new hive are preventing robbing (Iād probably reduce the opening down to even 1" width or less until their numbers build), laying queen, and feed them until they stop taking the sugar water. I know of bkeeps that feed a struggling hive all thru the summer. Iād use a feeder which is inside the hive, not one that mounts at the entrance as those can cause robbing behavior. If you need, a qt canning jar with a few nail holes in the lid, inverted over the hole in the inner cover, with an empty super over it and outer cover on top works well. The source of the sugar is far enough from the entrance to not induce other hives to start robbing, usually. In addition to sugar water you might want to feed a pollen substitute, if there are not good pollen sources around you (are the bees coming back with their pollen sacks full?). Bees canāt grow new bees without pollen.
You may want to watch a few videos on bees robbing hives and what to do. That way you can be on the lookout and take action if you see it happening.
The other thing Iād mention is try to NOT open the hive for a couple of weeks, if possible. I have read that opening the hive sets the bees back about a day each time. The weak box especially does not need any more setbacks. Itās fine to observe from the outside, or open the top to replace a sugar jar inside when needed. Just donāt take off the inner cover or start pulling frames.
It sounds like they are making it. Good luck, bees are great fun, and a constant source of amusement (if not work).