The lack of bass is from lack of boundary reinforcement. Do what's needed to keep these speakers because to replace them with something that equals let alone surpasses them is going to cost lots. They present an easy load and are fairly sensitive. I liked what I heard.
Something to try is to place them directly on the floor in the same position you have them now. This will allow you to hear what some mistakenly call room gain. Sure, the imaging etc. will suffer but not that much. Perhaps there is a height where the balance of sound is closer to your target.
You have bass traps which is good. Do you also have some broad-band absorbers at the first reflection points? You need to consider that all 3 axes should be treated. Absorption on either the back or front wall needed or both. Same for side walls. For the floor to ceiling axis an overhead absorber is better than any carpet but you may reject the idea so won't waste our time explaining what and how if you're not interested.
There is more to consider. If you find the bass increase to your liking when placing speakers on the floor then perhaps it's possible to mount the speakers in the kitchen area and then position your primary listening area about 38% from the back wall. At 50% into the room you are in a partial null unless you have extensive bass traps and employ a distributed bass array.
Finally, look into a multi-sub approach. Somewhere in these threads I mentioned how this can be inconspicuously incorporated into the decor. Huge subs are not needed. You can consider 6.5" drivers in a sealed box with an 8" square footprint which is not difficult to hide. Perhaps use one to support a pot plant, hide one behind the sofa. 2 such subs plus your REL will do more, much more , than just bass. The entire spectrum is enhanced. Check up on the theory and application of a DBA. Also try plugging the ports for a sealed box response which makes it easier to integrate with subs.