I don't know where they found this position with a large angle of open arms.
Try first this one:
_unit switchmove "AmovPpneMstpSnonWnonDnon"
If you're really unsatisfied or if you want to keep the "para_pilot" position, you'll have to change vectorUp. Using a vertical position like "para_pilot" and changing the vectorUp gives a best 1st person view during the fall so try to insert this to your script:
_inclin = -10;// change this to get different inclinations
_dir = direction _unit;
_InitUp = vectorUp _unit;
_InitUpA = _InitUp Select 1;
_InitUpB = ((Sin _inclin)*(_InitUp Select 0))+((Cos _inclin)*(_InitUp Select 2));
_InitUpC = ((Cos _inclin)*(_InitUp Select 0))-((Sin _inclin)*(_InitUp Select 2));
_unit setVectorUp [((Cos _dir)*(_InitUpA))+((Sin _dir)*(_InitUpB)),-((Sin _dir)*(_InitUpA))+((Cos _dir)*(_InitUpB)),(_InitUpC)];
Be carefull "// comments" will return error if copy/paste to a .sqs file !
Enjoy !