Fit question - draft legal

Sorry, but another fit question for you guys, thanks for any help and input - I really need it!

I am a Junior from GB, and although I’m pretty serious I have only just got round to buying some Aero-bars…I had some last year, but felt so unbalanced I sold them on…

The problem is that I race some Draft legal Junior races and some normal non-drafting races… so how does the Fit article on this site difer when related to a draft legal position - or dosent it??

I have some Cinelli Tri-bars which are ‘shortie’ so are legal providing they dont go beyond the brake hoods, but I have no idea how/where I should position myslef, the saddle, tribar angle, stem length etc.

I ride a Giant TCR in Medium… I’m 6’ and I have a 32 inch inside leg,…

I have a 9cm stem as the 11cm it came with seemed to give me back ache (??)
Saddle Height - 76cm from centre of BB to Saddle.
Distance from saddle tip to handlbars - 54cm

Using the arm to handlebar rule, I am 7cm from handlebar

These figures maybe (probably are!) completely irrelevant and useless, but I’m only 17 and cant afford a bike fit right now…

Please Help!
thanks
Sam