XR650R Cold Engine Temp

So now that I've been playing with my Trail Tech some more (installed the engine temp sensor inline between the head and thermostat) I can see that while riding down the road its COLD! like 135°F. I installed the XR's Only Radiator Cap, Thermostat then topped it off with some engine ice just a couple days ago. If I let it sit and run for a while it will reach 200°+, the highest I've ever seen it was 235°F. All the reading I've been doing says normal was 250°F. I know to hot is bad and to cold can be bad too. I thought 195°F was the ideal target temperature but maybe that's wrong...

Input?

135F's too cold, something is amiss. The thermostat opens
around 167f so this should be the minimum reading you'll see once warm. Mind
though, this cooling system has no bypass, it is meant to 'leak' through the
thermostat, it is what the small hole/cutout is for, and I've drilled an extra
small hole in the rim (of the xrsonly-unit) also.
Take the entire housing & sensor out of the system, and boil it in water -
it reads 212 or thereabouts (mind, depends on your altitude) on the display? If
not your sensor is wrong. If so your thermostat is open, it sticks, and you
better fix that.

In Celcius: the oem thermostat opens at ~78C, the xrsonly-one at ~75/76C (both
measured with glass thermometer). I do see these temps as 'minimum' also sortof
(on the Trailtech), and the highest reading I've seen is 135C, when it boils
off (a good thing, pls note).
Engine Ice is a good thing I've read, but stay away from the other stuff that
does not boil off (forget the name) as this has only 70% of the cooling
capacity of water-based coolants, ergo your engine will get way too hot whilts
all the telltale-signs (boiling over) are missing.
Boiling over: is a good thing, this keeps the engine-temp in check! Be warned
though, you may only do this for very short periods, and must let it cool off
after it before you hammer it again. The boiling-over is turning liquid into
gas, for which conversion a lot of heat is needed, so the engine is
cooled well by this. This causes coolant to be pushed into the expansion tank
(it 'fills up') because the top-of-rads fill with steam... and that
means a lesser cooling capacity of the entire system, note well pls.
If the bike boils over simply stop, and let it cool down. The liquid from the
tank is sucked back into the actual cooling system, and after this you should
fist check if there is liquid left in the tank. If so carry on riding but at
higher speeds (to keep things cool), but if not top the tank off first before
you carry on.

If you regularly boil this engine you ride too slow, singletrack riding springs
to mind. Mount a fan will help, but riding more open faster terrain helps a lot
more.