It looks to me like you have the whole suspension wrongly assembled if it is a 4A. The long arm should be at the front and the short one to the rear. The front arm will then correctly show the "L" that is stamped on the other side. The ball joint should be lined up with the shock mounting hole, not well in front of it as in your photo. This will be the case when you put the arms on correctly. The way you have it also has the kingpin inclined forward rather than back, which will give some weird handling effects.
The upper fulcrum should be reversed also. This seems counterintuitive as it has the bend in it which went around the upper shock mount on all the TRs up to the 4. When Triumph fitted IRS to the cars, it changed the rear roll centre. They had to alter the position of the front roll centre to adjust the handling. They raised the lower pivot point mount from through to above the chassis. The brackets that they used are a well known failure point, and if you have not fitted the strengthening brackets (available from all the major TR suppliers) you should do so before you go any further. They also reversed the upper fulcrums to get the geometry that they wanted. Being Triumph, they used what they had rather than designing a new part.
Neil Remington had an article on his website about the fulcrum issue, but I can't find it at the moment.
Hope this helps.