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If an Allomancer is stronger, they not only can burn their metals faster in order to get more Investiture, they are also more efficient. Would the same principle apply to Feruchemists? So, say there was a Feruchemist who had one or more Hemalurgic spikes that granted them the same Feruchemical power, making them into a stronger Feruchemist. If the same rules apply for Feruchemical strength as Allomantic (which I suppose they may not), then they should be able to squeeze more of an attribute out of their stored Investiture. Even if they were already at peak efficiency, which considering how Feruchemy works is entirely possible, if they used Hemalurgy to enhance their own Feruchemical power they should still be able to get more Investiture out of their stored attributes. Since their spiritweb is now larger and more Invested due to having Hemalurgic spikes added, there is more Investiture to divert from themselves into their Metalminds, thus allowing them (assuming my theory is correct) to actually get more of an attribute than they normally sacrifice. In other words, 10% of a Hemalurgically enhanced Feruchemical attribute would contain more Investiture, and therefore more actual ability, than a non-Hemalurgically enhanced Feruchemical attribute. I suppose that this may not actually work, however, and it may just be that you can store more of your attributes at once, which would not be very powerful compared to what else you could add onto yourself via Hemalurgy.

I have been rereading the SLA and a few things have stood out to me. One of which is when Jasnah's hand sinks into the rock she soulcasts into smoke in front of Shallan and King T. That scene looks very similar to the stamps used in Forgery that sink into the material being forged. Soulcasting is basically feeding an object investure and getting it to change permanently. Forging is basically the same thing only it takes less investure and the effect is less permanent and takes a far longer time to prepare for. My question(s) are this: Is soulcasting as functionally similar to forging as I think it is? And: Could this link be exploited to hack either of the magic systems using the other system, if so, how?