Pittosporum tobira

Here's an odd one. My variegated form of this grows like an express
train and nothing could be more healthy and vigorous. But the type has
'something' up with it. Question is, what? 

Leaves continually turn yellow and drop. Sometimes they twist before
they drop. (Now I'm on to dance-crazes rather than bands....) No
OBVIOUS sign of aphid though that's still my main candidate for
culprit. It continues to grow, at some speed, but it looks (not to be
unkind) a mess. Almost directly next door to it, incidentally, is a P.
eugenioides, glowing with health and growing 2ft a season, so I hardly
think it can be soil or situation which is the cause of P. tobira's
problem. 

Anybody have any ideas about what it might be?

I should perhaps add (sorry: I know this is for the n/th time) that my
climate is moist but mild and my soil is naturally heavy and acidic
but has had masses of added drainage material introduced into it. The
situation these two - and a perfectly happy P. revolutum further along
the same bed - are in is S/E facing, which is almost as favoured as
this garden gets, since W. and S.W. are the directions from which our
salt-laden gales tend to come. Ie, I expected it to sit up like Tigger
in A.A. Milne when offered - was it? - honey, saying, 'Ah, so THAT's
what Tiggers like.' I'm not so much grieved or miffed as just plain
mystified. If the other two had looked unhappy, I could have
understood it, since I know I'm pushing my luck trying them in this
climate, but P. tobira?? Come on, get real...

TIA for any suggestions.

Tim on the tropical Solway - well, almost: 85 and rising...
Tim Longville
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