Magento 1.8 – How to Remove Sign Up from Top Links

So my website currently has a "Register" button and a "Sign Up" button. The "Sign Up" button doesn't show up on mobile devices no matter what, so I figure removing it is my best option. I can remove "Register" successfully, but again, mobile view wouldn't have either one then.

I've checked and tested in two files:
local.xml and customer.xml

For local.xml I tried commenting out the following reference:

<customer_logged_out>
    <reference name="top.links">
            <action method="addLink"
                ifconfig="ultimo/header/signup" translate="label title"><label>Sign Up</label><url>customer/account/create</url><title>Sign Up</title><prepare>true</prepare><urlParams/><position>101</position><liParams>id="link-sign-up"</liParams></action>
        </reference>

    </customer_logged_out>

Which unfortunately did nothing. (I'm saving these in my custom theme, not in /base/default directory)

In customer.xml and local.xml I've tried removing it by adding the following removeLinkByUrl:

<customer_logged_out>
    <reference name="top.links">
       <action method="removeLinkByUrl"><url helper="customer/getRegisterUrl"/> </action>
    </reference>
</customer_logged_out>

Please point me in the right direction!