Congratulations on the acquisition of your Signature 15. I am certain you will get a lot of enjoyment from it!
It might be helpful to know what your budget is for speakers. Having said that, if you are looking at the Tonian TL-M1 perhaps I can make the assumption that would give you around $1,800-2,000 at the top end to work with. By all accounts the Tonian is a great value and a wonderful addition to a system but for your application might not plumb the low end quite enough. There is at least one prominent poster on this forum who owns the TL-M1s, however, who does not seem to have an issue with this.
Options abound but I will limit them to a few

. There is a pair of custom-made Hawthorne Silver Iris open baffle speakers that are listed on Audiogon for under two grand (the price has dropped almost $500 and they come with the plate amps to drive the Augies). That would give you the bass that I think would suit your musical tastes. The downside is that they are quite large.
Another route to take, and one that is less expensive, is to consider the Tekton OB 4.5s, mated with their subwoofer counterparts. Along a similar vein you could pick up a speaker like the Omega Super 6 Alnico that is listed for under $1,200 on the 'Gon and partner it with one of Louis' subwoofers. That would put you at the top end of the budget again, though.
The Hawthorne/Tekton/Omega options I have mentioned all give you frequency extension below 30Hz. It then becomes a matter of personal taste from there.
Wish I could say I have had the funds to try all of them out, but then I would be lying...

I hope you find what you are looking for!