Long headshell required

Are you talking about a common universal headshell? If so, your request suggests something else is off in your alignment, such as the P2S distance. It might help to know the pickup arm that you are using.

Because of the base of the tonearm, EPA100, being so large it is difficult to move it closer to the platter and hence the P2S distance is short.   Having a longer headshell will rectify this, rather than dig into the plinth.

Appreciate your suggestions

I don't think you can offset a P2S distance that is too short by increasing overhang, @koala.

If the arm base is "so large" making it difficult to locate closer to platter, then the P2S distance will be longer not shorter.

You are right, @solypsa. Good catch! But my point is the same - increasing overhang won't offset a misaligned P2S distance.