get used to using quad sticks and you wont look back
Make 2 sets of Bipods using garden centre canes and inertube or marten gale rubber from equestrian shop
Get 2 more marten gale rings and link the bottoms of the bipods together.
Spend a bit of time practicing;
Put the front bipod imediately behind your harris type bipod or equivelant and the rear bipod just behind the rear sling swivel, make the V at the rear minimal, the contact area is minimal so there is no advantage having them longer, this makes it easier for you to get round the rear bipod and get a good cheek weld. With a bit of practice you should be able to acheive sub 2 inch groups at 100m from the standing position with a good quality rifle and ammo (normaly a sub moa from bipod set up).
Dave