I agree that direct , full day sun , reduces the color and length of time that the new frond has . Mine is in full sun almost all day and the red leaf only lasts 3-4 days . I am inland so it is warm here , not like near the coast . With regular flood watering and a bit of organic fertilizer , the burning has been significantly reduced and the palm looks much better than previous summers . The “ red leaf” still doesn’t last but a few days . I only have the one Macrocarpa , no Hookeri . Harry
‘The new frond shows a burgundy color but only lasts a few days. I will say , these palms get huge fronds when they mature. Mine is getting a flower spathe this year.