I have Ludwigs, but on the floor toms I have Premier legs and Pearl rubber isolation feet. I also put a Premier die cast rim on top of a black & white badge 6.5x14 Ludwig brass snare drum. My double tom mount is Tama. These were done for reasons of better utility and or sound, not just for kicks.
As a kick reso head, I'm using a ported Fiberskyn with a coated PS3 batter. I've also used a ported smooth white Ambassador as a reso with the PS3 and sound-wise, I didn't find much difference. I'm able to dial-in the same tone in both cases if that helps you at all...
I had a Premier Projector series kit that had a 15" deep x16"FT. It it was great. It had plenty of growl. (It was paired with a 16 deep x18 FT.) No real difference between that and a 16x16 FT, but I don't know about a 15x18..
I play a 20" kick without a riser and I'm happy with the sound I'm getting. It's also nice not having another piece of hardware to keep up with. I did use a riser with an 18" kick for a while, so I've dealt with them before.
Interesting, I also keep coming back to the Vater Sugar Maple 5B as a go-to stick for the past 15 years or so. I also like the VF Akira Jimbo sig sticks, but they're completely different thing all together.