You CAN make the amp more of what you want but it's good your at terms with the fact that it's simply not a "metal" amp. Sort of like trying to make a Ford Pinto into a street rod. Sure you can make a cool fast Pinto, but you can make a much faster Mustang.
The SLO mod shouldn't take away much bottom end it just won't overdrive the bottom end into mush. That doesn't help you anyway since turning the bass up past the point where it's distorting doesn't make more bottom end, just more mush.
Rather than tell us what you want it to do, when looking for a mod suggestion it's better if you tell us what the amp isn't doing for you. Then mods might be suggested to fill in the gaps. ie: "The amp is too bright" or "I want more gain but less mush".