I only just looked at it properly as a comparison.
I think now they did rotoscope the lasers again and made them deliberately pink.
Because many shots in the original theatrical film on Hoth have no white hot or bright cores.
So going back to what you were saying about bright light in the day time it does make more sense that the lasers in daylight or fairly bright conditions lose / diminish their bright white cores due to them being subdued from the surrounding daylight. They are also fairly transparent and not solid.
but if you really want to keep the white cores then keep the pink.
And the Red would also go a different shade because of the daylight like a bit more pinky purple red but not full on pink... The original is more crimson with no white core.
