Ok, so I took delivery of the Tama Speed Cobra 910 and the Yamaha FP9500C. I played my Tama HP200 for a couple of minutes then I put on the Tama Speed Cobra 910 and played through two songs I'm familiar with and then stuck on the Yamaha FP9500C. I immediately felt the smoothness of the Yamaha, it was much smoother than the 910 and even more smoother than my HP200. I then took a break for 15 minutes and came back and spent 20 minutes swapping between the FP9500C and the 910. Both are really good, but I just felt the Yamaha was smoother, like liquid chocolate, just had a nice feel under the foot and felt a trifle lighter with the out-of-the-box settings. When I put the FP9500C and the 910 next to each other on the floor I pushed them down with my fingers of my hand and just spring the pedal board up and down a few times and the Yammy definitely feels silky smooth while the 910 had a bit of 'grittiness' about it and a few very subtle squeaks etc.
I played the Yammy for a few songs and then stuck my original HP200 back on and it was nowhere near as smooth or responsive as the Yamaha so I'm keeping the Yamaha 9500c and sending the Speed Cobra 910 back to Amazon for a refund. 910 comes with a nicer case though, in the style of a Pelicase, but not as tough as a Pelicase, while the Yamaha comes in a decent enough padded canvas case with reinforced walls, top and bottom.
I have the Yammy set with the spring quite lose at the moment, while I get a feel for it. But I suspect I might tighten it up once I get used to it and get a feel for it and, more importably, after I actually develop my kick technique a bit more as somebody on here mentioned that could be the issue and there is no doubt that is a part of it, but this pedal helps and it feels amazing. Oh, for sock and bare foot home practice the Yammy board is unbeatable, feels so smooth and nice!