Don't sweat the forward assist in any way, shape or form. A forward assist on a .308 AR is about as useful as an elevator in an outhouse!! It is just not necessary. If the increased force of a heavier mass carrier, stronger spring, etc. won't get the round chambered...then it probably shouldn't be chambered in the first place!!
Also, some of the FA designs common on the DPMS pattern rifles aren't all that useful anyway as instead of engaging the carrier via serrations on the side of it (like AR-15's do)...they push on the rearward-most lip of the carrier which actually gives you very little room to move things along at all and not a whole lot of force anyway.
As for long-range precision semi-auto with battle-rifle levels of reliability...I return to the POF. Mine has been outstanding with a variety of different ammo and with quality match ammo and my handloads, is a consistent sub-MOA shooter when I do my part. Now...if you want a more accurate rifle (THE MOST ACCURATE) that will also give you a high degree of reliability, then I'd recommend looking at picking up a GAP-10. With that, you get the utmost levels of accuracy and reliability of any semi-auto made today, as well as a rifle that is specifically tailored to what you want/need (even if you aren't quite sure what that is
) as you can outfit the rifle within GAP's parameters with custom calibers, barrel lengths, etc., etc., etc.