Sabenaboy - sorry to hijack the thread...
Personally, working at TC, I do not trust TPLD, especially not the line that shows supposed complexity.... how can a flight on a certain route be considered to be more complex if other flights are not taken into consideration?? Scoring a flight for its complexity in isolation does not work.
However, I cannot recall an overload at TC caused by reliance on the TPLD (I may be wrong tho)... it is there as a guide - strip outfall or equivalent (including a good assistant who will warn you that there are a lot of pending strips about to come out), should be one of the main factors in deciding to split/bandbox.
TPLD is purely an aid.... as an ATCO familiar and experienced on a sector, you should have the ability to recognise when a split is needed.
We often split unneccesarily at TC, manpower is a management problem and certainly on my watch we split early to a) protect ourselves and b) help highlight to management how woeful the manpower allocation often is. (In respecty of point b, I don't mean we do it for the hell of it, however if we have any doubts at all about the need for a split, we will do it and will not allow the GS to persuade us otherwise... which to be fair, they do not often do).
If it turns out the split was not needed, we can easily bandbox again.