Yes, you spice will be cleaner if both the jug and the solvent are not hot. You won't pull quite as much on your first pull, but it will be cleaner. The spice not picked up by the solvent on the first pull is easily picked up by 2nd and 3rd pulls.
HOT pulls more oils, cold/room temp pulls a lot less.
I'm not sure you need to bring up the pH to 13.5. I have always had very nice yields from 12.0-12.5. Raising up the pH past 12.5 really doesn't do much but keep the emulsions down.
Other than that your extraction sounds pretty sound.
The Spice extends life
The Spice expands consciousness
The Spice is vital for space travel
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