The Searing Touch - feedback

This staff needs some love. I found one that has level 14 Fire bomb. So when I got my fire mage to 58 I tried to switch to it. Just swapping between the regular staff and this unique was a huge difference. The regular staff had the bombs damage at 1621 dmg , when I switched to the unique it went down to 680. which is a massive difference. I figure maybe the + to ignite magnitude would make up for it but no, not even close. I should mention I also have a lot of the + to ignite passives on the tree. I tried switching many support gems also , from ignite duration to more magnitude ect.. but nothing made this even come close to the damage the regular staff did.

Stats on regular staff - 42% spell dmg , 64% fire dmg , 120 mana , 32% cast speed , 20% crit dmg bonus , and 4 levels to all fire spells.

Stats on unique - 94% (120 is max) fire dmg , 14% (20 is max) cast speed , 100% increased ignite chance , 100% magnitude.

This unique seems to need +fire spell levels and much higher cast speed if you want it to compete with the regular staves.

Of course this is only level 58 , so there are a few more ignite passive I could eventually reach but the damage gap seems so big I just don't see the damage catching up.

Is there maybe another unique to pair with this to make it usable?