Bazmati,
I'm based over in Ireland and am a member of the Tenchfishers - if I can help you out in any way, I'll try my best.
The tench have spread to loads of waters which never previously held them and systems like the erne around cavan are now full of tench. You have the old favourites like Clare, Carrickmacross and the shannon system in places which have always thrown up good tench catches but if I were you and you were looking for something a bit different, I'd look at visiting Roscommon, Leitrim, Longford or Cavan for quieter fishing and if you time it right some serious bags of tench.
I can put you in touch with lads in these areas who can point you in the right direction.
Regards,
Fin