EEA (QP) reg cert application - employment docs

Hi

I'm planning on submitting an EEA (QP) application in February through the EPR service (I haven't reached five years for PR yet).

I've been working full-time for the same large UK financial institution since November 2013.

I know the guidance says provide either an employer declaration or letter, and wage slips and/or bank statements for the last three months - is this likely to be sufficient?

I know the HO are fairly picky (going beyond what the EEA treaty regs state etc) and I want to make the application as strong as possible. Do you think I need to bolster it with tax documents or go back further than three months? Include my employment agreement etc?

Any thoughts as I get the application assembled would be much appreciated - even though I know this is probably the simplest EEA application out there!