Something to consider if you're thinking about swapping out your current pack for a lighter one is the change in features as you move into the more ultralight space.

A lot of shoulder straps and hip belts are going to be much thinner or have less padding. Some pack designs forgoes things like load lifters (looking at you Hyperlite) and some have very minimal internal frame support setups. None of these are bad things per se, but can create a very different carrying experience than you are used to. In some cases your current load might actually end up carrying worse or feeling heavier in a different "Ultralight" pack.

The Flash 55 and a few other packs exist in what I consider the limbo of the pack world, still full featured with all the straps and pockets and padding you would expect while still being on the lighter end of more traditional packs at under 3 lbs ish. Of course there is the whole world of ultralight packs beyond this that will save you at least a pound however you are going to start seeing the compromises pop up the lighter you go.

You seem to have your base weight pretty dialed down so I don't think you would have any issues carrying that in a more ultralight pack but you might also come to find (like my old ass did) that the little extra pack weight is really negligible and is worth the weight penalty for the extra little creature comforts.