Hi John ,
The reason that many RIBs have their console positioned about one third from the bow is that this is also the pivot point of a craft when in displacement mode . Therefore , when in low speed displacement mode for close quarter manoeuvering ( i.e. a rescue scenario ) the Cox , seated bang on the pivot point , feels that they have the boat strapped on around them .
As the boat progresses to planing mode , the pivot point moves to mid ships .
In your case I would move the console back towards a point where your seat is midships . This will give you that nice in control feeling while at speed and will optimise your forward deck space for lounging.
If you go too far back then the boat feels weird to drive ( Imagine driving your car from the boot ! ). You can also suffer from a light wavy nose ( very dangerous in a following sea and disconcerting to drive ( like driving a front wheel drive car in the rain with bald front tyres ).
Are these the new bolster seats you are fitting ??? I have heard ( third hand ) good reports on these . It would be interesting to hear an opinion first hand from some one who has lived with them .You might let us know !
One other small matter which should not be a factor in your 6m craft. I am personally against side by side seating in RIBs under 6M as an uneven no of crew can unbalance a boat any smaller . Therefore the best seat layout is a double pillion ( one behind the other ) for the cox combined with any other layout you like . This arrangement allows the boat to be balanced with either an even or odd number aboard .
Can't help on this particular engine front ...but have a look at the detailed 4 stroke discussion we had recently elsewhere on this forum ,
Hope this is of some help !
Best wishes ,