Remember also if you have the R4 tires on the 2555 they are very wide and would create more drag while your trying to turn.. with a heavy load on the bucket it will feel stiff....
Big question though.... you need to be sure your rear hyd remote lever is in the middle (neutral) position... this has a detent and will hold itself engaged until put bag to neutral... I see it very often were someone will hit it not knowing and have the pump sending pressure to it... this will decrease overall power and hyd strength like your stating. Left engaged for extended periods can lead to a very very big mess since it will heat the fluid up and start melting internals... in the HST and shuttle machines of the 2500 series
Big question though.... you need to be sure your rear hyd remote lever is in the middle (neutral) position... this has a detent and will hold itself engaged until put bag to neutral... I see it very often were someone will hit it not knowing and have the pump sending pressure to it... this will decrease overall power and hyd strength like your stating. Left engaged for extended periods can lead to a very very big mess since it will heat the fluid up and start melting internals... in the HST and shuttle machines of the 2500 series