Do NOT write zeros or anything to a SSD in an attempt to clean it as TRIM does.That will not benefit anything and only cause more performance degradation.
Any time anything is written to NAND storage cells, it is then in the used/written to state. Before it can be written to again, the NAND cells must be cleared/reset to their "ready to be written to" state. That is what slows down performance, the time it takes to prepare enough NAND cells that are not reset before they can be used. TRIM commands tell the SSD which data is no longer needed, and the SSD can then reset those NAND cells when it is not busy.
When you mentioned "... optimises storage of zero blocks.", that sounds like a data compression like feature, created for HDDs? The SandForce controller in a 335 does data compression of its own, but I would not expect a SSD to perform anything designed for HDDs.