Power issues

Got a disco 300tdi and as of late I've noticed it's started lacking power esp, uphill. It starts and runs as sweet as can be, just when gets to between 2-2500rpm, the boost dies off completely up till then it's fine. So far I've changed the lift pump, filter, the copper washers and bleed the system as read up could be a fuelling problem but no luck as of yet. Was wondering if anyone else has heard or had this problem as starting to drive me a bit mad.
Thanks in advance

Try here, blokes got same problem.

http://www.landyzone.co.uk/lz/f16/power-issues-191958.html

Check your turbo pipes/intercooler pipes. They may have started to break down internally.

They can also go soft, and collapse when at full boost, cutting off or restricting the air-flow.

HTH.

The turbo pipes are brand new silicone ones as thought this could be another reason why losing power really is baffling me

Could be the turbo prop shaft combo rig.