Raking Angle

Try a thicker mat,or a few records stacked carefully,to raise the cartridge to see if that is the problem.I don't know if that will change it(SRA)enough,but it's a quick easy experimental trial.

Jwglista,I use Scotch electrical tape.I start with pulling from the roll,then fold it at 1/4" lengths,or longer if desired.Keep folding until desired thickness is reached.I use that for spacing.Sometimes when things don't sound right,I put a couple of layers on the arm before mounting cartridge. If both aren't completely flat,it acts like a gasket filler material,and keeps vibration(rattle) down between arm,and cartridge body.Its cheap,you could keep changing thickness,and it works for me.Use extra care in tightening the screws.I don't think you need it very tight.I never had one break,but heard others have.

A metal shim might rattle.I've been using the tape for decades,and dealers like the idea too.It stops rattles.Some were using Blu-Tack,but switched to the tape method.