Según la fórmula

"The total amount healed depends on the character's level and is increased by either ~110% of the caster's attack power (22% per tick) or ~188.5% of the caster's spell power (~37.7% per tick), whichever bonus is higher."
El heal base en lvl 80 es 1235.

Por lo que si tenes 2k de SP, te helearia (2000 * 188,5)/100, = a 3770 + 1235 por ser lvl 80 = 5005, dividido en 5 ticks con 2k de SP te cura 1001.
No deberia tomar sp Y ap, deberia tomar sp O ap.