Bad Vibrations, front end, steering vibration, comes and goes-causes? Options

[DRPHIL914]

so I know the most obvious is a possible wheel balance issue and ill start there, - but here is what makes me thinks its not that- its at about same speed or close, between 60 and 70- goes away sometimes if going same speed but going around a corner etc- could be linkage? -
whats new- the whole front end with in last 2 years except the shock inserts. - 5 lug hubs new bearings last year with new A-arms and bushings and turbo tie rods, front end was balance and and aligned by professional shop(bob woodman tires) that is a 911 race shop too- turbo tie rods were installed by Georgie- 40+years working on Porsche's recently retired from HHI Porsche forced retirement at 70- SO -

maybe check tire balance first I suppose? ths shocks feel fine but I don't know how old they are- all bushings etc were new with in 2 years-

Thanks,

Phil

PS - how hard is it to put new inserts in front and do I have to re-align afterward??