I really can't think of a situation where surge in Feruchemy would ever get confused with Surges in Surgebinding. One is a verb, the other is a noun. For one, so far in Stormlight Archive, you never see "Szeth Surged something," it's "Szeth Lashed," or "Jasnah Soulcast". Is that ever going to get confused with the context of surging that we're talking about here? "Wax surged his steelmind" very different. So I guess I see the objection to surge as "oh no it's a common word!" However, the usage is totally independent. Even if I wrote a cage match battle where Szeth fights Wax (the only time where it would be ambiguous), they are very distinctive. In this light, I still fully support surge as the verb we want, because there isn't an actual context that would be written which makes it confusing. By all means, try and come up with an example where it would be.
Surge is a stronger verb than anything else here, and let me consult the dictionary a moment...
Wow, that's like the exact definition of what we want.
But no, you're totally right, let's throw away a precise, evocative word because it might be ambiguous in a context that would never happen in any books, despite the fact that even if it did happen, there isn't an example of a sentence where you could actually make it confusing.
"Wax surged weight" > "Wax overtapped weight"
Happyman makes a good point regarding whether we even need a term. I personally think it's useful to use it for theoretical discussion, if only so people don't refer to it as Compounding. And if we pick a term, surge sounds the best of them all, tenfold. We don't refer to flaring as overburning, after all.
EDIT: The only context where Feruchemical surging would be ambiguous with the Surges in Stormlight is if Surge suddenly became a verb in later books. Yes, it is possible, I suppose. But from what we know, Surge is a noun. Surgebinding has a symmetry with Voidbinding, and you don't "Void" something. You wouldn't "Surge" something either.