Yep, That's your problem! That General Altimax is waaaay over-inflated for a tire that's capable of carrying probably something well over 1000 lbs at that pressure!!
And just btw, as lightly loaded as you ride, the load on your Spyder's rear tire is going to be a LOT less than that! 
The OEM Kenda (& their clones) are made significantly 'lighter' than the General, with lightweight construction and thinner materials, and as a result, the Kenda TRULY NEEDS about 28 psi to carry the load of a Spyder because of that lighter construction so that it won't over-heat; but once you change the OEM Kenda tire out for something, like the General Altimax, that's capable of carrying 2 or 3 times the load at that same 28 psi, then you REALLY DO NEED to reduce the tire pressure you run simply because you're Spyder isn't anywhere near as heavy as a car - it's a whole lot lighter, so you need a much lower pressure to do the same job (or as many here have found, a significantly better job!)
Running 28 psi in a General Altimax fitted to your Spyder is waaay over-inflating it for the lighter load, and because of that, it'll never be able to flex enough to warm up properly/enough to let the tread properly 'grip' anything, no matter whether it's wet, dry, smooth, rough, icy or anything; it'll never be able to conform to all the little irregularities in the road surface, instead, it'll just slamming into and then skipping across just the high spots on the road surface (giving it far less actual contact in area and time/duration with the road surface); it'll feel like you're riding an un-sprung cart running on solid steel wheels, and as a result every little dimple in the road surface will be significantly hammering and pounding your Spyder's suspension (likely/eventually to death!); and over all, it'll be significantly detracting from the safety, traction, longevity, puncture resistance, and ride et al of your Spyder!
Drop the pressure in that General Altimax down to about 18 psi (even 19 psi is a tad over-inflated for most, unless you're often running at high speed for hours at a time in high ambient temps, or maybe if the road surface is tarmac melting hot!!), spend a bit of saddle time getting used to the way a radial tire is designed/intended to run at a more appropriate pressure for the lighter load, how it should feel, and start enjoying the better ride, the greater traction, the better handling, the better wet and dry weather/road performance/braking etc, the greater puncture resistance, the longer tire life, and more, that everyone else who has already done this has discovered.
That said, it is your ride...
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