Right, I extended the boom by an inch this morning.
Did a quick round the block blast and it feels ok and not too stretched. In fact I could probably extend another inch.
Now I am completely ok with the balance and ride of the bike I do now find myself 'bum further forward' riding.
Am doing a 50+ miler tomorrow so will be a good test.
Time Atac pedals have turned up, new shoes haven't.