Putting out some black smoke when under load

My 200 tdi was working fine, I thought I would give it a treat and poured in some injector cleaner. Since then it has been putting out some black smoke when under load. I have changed the air filter and diesel filter; I discovered a turbo hose had split so I have renewed all the turbo hose for silicon ones.
It doesn't burn much oil. I never have to top up the oil in between services.
The amount of smoke seems to vary depending on the atmospheric conditions I think. Is there anything else one should check before seriously thinking about injectors and replacement. Its done about 150 thousand miles. Starts on the button even down in -18 C; Runs sweet. Will cruise at 70/75 mph without any problems in fact the faster I go the less it smokes, its just when getting up there.
Any suggestions please.

Sounds about normal to me !!!

Mines the same, smokey under load, when it stops smoking then worry haha

I have ignored the smoke and it seems to have disappeared. It got through the MOT so can't be bad.

Hi,

Just to let you know:
"Black" smoke is cause but over loading, eg Not enough air in the mix.
"White" smoke is cause by excess / unburnt fuel. Could be leaking injectors ect......
"Blue" smoke is caused by burning oil. Could be rings, turbo, or leaking valve stem oil seals etc....

Guess the snorkel proberbly doesn't help mine