I agree with Dave and JC. Looks like a lack of cleanliness, and i'd be checking clearances too.
To give you an idea about cleanliness, I used to spend near on two hours washing and scrubbing a block after machine work. I have a selection of different size bristle brushes for scrubbing out the oil galleries and a scrubbing brush to dislodge crap from the bores using Drive and water.
it was the most important part of a build up IMO, apart from measure, measure and re-measure

(OK I might have a touch of OCD too

)
Phil, pretty sure you can't get OS pistons for the TD5.
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