[antialiasis]

That hack replaces the USERCP template (which is what you edited for this hack) with another template, USERCP_PLUS, so the problem is simply that USERCP_PLUS is what you should be editing instead of USERCP. Admittedly, this makes your User CP home page so big that if I were you, I'd probably put the personal notepad at the top of the page instead of at the bottom - in fact, I'd take the whole thing from this:

<if condition="$show['privatemessages']">
<!-- ############## PRIVATE MESSAGES ##############  -->

to this

<!-- ############## END NEW REPUTATION ##############  -->
</if>

and move it to the top of it, placing the personal notepad below what I just moved. But that's just what I would do - I just think new subscriptions and PMs belong in a more prominent place than at the very bottom of that very large template.