Yes, A lot to fiddle around. You can increase the volume of the subwoofer by going in to setup>config>levels>subwoofer, if I recall the path correctly. Also, you can set the crossover between 120 and 200hz and see if you like it. Crossover is nothing but a setup to filter the bass from all other speakers and send it to the subwoofer. at 200Hz, it sends the bass frequencies below 200Hz to the sub and rest will be sent to all other speakers. I don't keep the extra bass On as it increases bass in all the speakers and I didn't like it. Also, you can go into tone settings, by pressing the options in the remote and increase the bass there.
The subwoofer placement is important too. you need to place the sub on the floor, move it and find a sweet spot. Another idea would be to place the sub on the chair where you sit and you crawl around the floor to find a spot where the bass is pleasing and place the sub there. It is a small 6 1/2 inch woofer and cannot expect more from it. But, the bass is tight for what it puts out.
yes, I always leave the enhancer On.
It takes a lot of trial and errors to set up a nice home theater system. It is been more than a month since I have purchased it and I'm yet to fully understand it. Partly because of lack of time. And also the system is a bit complex but joy to use.