Some Crafting Help Please.

I have partially crafted a Siege Crossbow, but I am not sure of the best way forward from here.



I need to add % Physical at T1 or T2. Then happy with any of the % elemental damages or the %Phys + Accuaracy to fill out the Prefixes and I would suspect Attack Speed as the best target for the empty Suffix.

I currently have 7 Div and 470Ex in direct currency (no perfect Ex), but have already bought a bunch of Omens, Abyss items and Essences that I may need.

I don't expect prefect as I don't have the funds, but want the best I can do for the currency I have.

Can anyone assist in the best steps from here, whithout spending huge amounts?

I would use an abyss prefix o it for the choice of 3 options to try and hit something good.
Then exalt it up and then try a perfect essence of haste to put onslaught on it if you don't hit attack speed naturally and hope you don't remove the skill levels.
If you do remove the skills then you will need to alternate prefect battle and hastes until you end up with both.