Your fire is totally fine. My first well charm was a 95ee earth and I still had very good success because I was using a 120ee focused heal.
Prices have changed since I bought my gear, but I got my robe for 200, my dagger for 600, my MQ earth for 1050 and my MQ heal for 2k. But I can actually well fine with my 100ee level 50 earth as long as I have my heal - so having a nice EE heal either focused or regular will increase your success rate a lot.
Intelligence gear is like the icing on top of the cake. You can't have shitty cake with bomb icing - that isn't good. But a very good cake with decent icing is way more acceptable. That was a terrible analogy but basically you should focus on upgrading your heal in my opinion. Even if you sold that one you'd be making 100% profit because of that dumb person so you could go out and buy a lower EE charm but just a different type and it probably wouldn't even cost anything.
So yeah, I think that 30+/30+ should be totally fine for a still decent success rate
