A couple of things to consider before giving full throttle to a cool engine.
1. Application of full throttle causes rapid heat exansion of the pistons. If the CHT isn't up, the cylinder bores haven't yet reached their full working diameter. This results in a reduction of clearance between piston / bore and might result in bore scuffing or piston ring area damage.
2. If the oil is too cold, the oil pressure is likely to go high enough to force the oil filter bypass off its seat so you are running cold, unfiltered oil around your engine at full power.
Neither of the above is likely to result in good engine longevity.
