Tzhaar Fight Caves Runescape?

I am doing tzhaar fight caves for firecape in runescape. im just wondering, i dont want to spend the whole like 1m for 1k diamond (e)'s. so i bought 1k addy bolts, and i am just wondering that if i should still buy 100 Diamond (e)'s to switch to when i reach the jad, or if the extra p pot or w/e for inventory is more important. ps- my levels are 80 def, 80 str, 78 attack, 81 hp, and 71 ranged.