Comparitive ending and stress

When using "ee", is there a way to predict whether the stress will be on the stem or the ending?

The stress in the simple comparative usually falls on the first "e" of the "ee". длинee and милee

If the word has three or more syllables, the stress remains fixed.
приятнее and интерeснее

Thanks. I assume any variances will have to be memorized?

Thats the general rule. But there are always excpetions that need to be memorized.