I would not remove the tail.
I did that mod to both my SAR's and though it did eliminate most of the t-slap, it was not 100% a fix, with finger ache returning when shooting in deep cold.
I'd replace the trigger group with a K-Var.
Recently I replaced the original FCG w/ a K-Var double pull WITH the tail, then removed the trigger guard rivet, replaced that with a #8 machine screw and adjusted the height of the screw inside the receiver to support the tail of the disconnector. This required one washer under the nut. The disconnector tail then just barely cleared the nut, providing support during carrier reciprocation.
Result; 100% NO trigger slap on my rifle. Even in deep cold. None.
This is evidently the current fix on the AK-100 series rifles which is accomplished in production with the use of a thicker-headed rivet.
I am now replacing the FCG on my second SAR and will use either a #8 machine screw or rivet made from a 16d nail.
Again, the change is well worth the added work and cost of the FCG.
Also, yes, by all means get a pin retaining plate. The shepherd's hook is a purgatorious nightmare.