It's good to see someone has found a few fish there. Some amazing scenery & a few good nights in the pubs. You guys look to have battled the elements and come out smiling. I hope you get some good conditions for your next trip and get to post some good photos up.
Me & a couple of mates took a big cruiser + fishing punt out onto Derg / Shannon for the 1st week in september just after that heavy rain. I'm no two-session-a-week match angler but after 35 yrs at the game I can tie a hook on the end. Don't ask how many bream we caught between us, you won't get an answer, there isn't one!
We tried pre-baiting, we tried night fishing, we tried fishing in the rain, then we went up the river to see if we could find one there. I've not visited the Shannon before but I was dissappointed, it's mile after mile of dense reeds along both banks with just a few pegs downsteam of Portumna - no-one catching much there, and a few platforms a bit further up.
We did find one likely spot near the Bannagher marina but with the water up & only one possible peg it looked difficult - then the outboard packed up & we nearly got shipwrecked against a big rock on the edge of the marina due to dodgy rowlocks on the punt. Best sport was taking turns at trotting for small roach off the back of the cruiser one morning for about 7lbs. I did manage one 15lb pike

We parked the cruiser back at Portumna, got back in the car & fished the small cut at the end of the river thursday night (no bites) & baited for friday morning. I spent the last hour long-trotting (30 yards) with the bailarm off for six rudd on a size 18 single caster.
Maybe we'd have done better without the rain, maybe we should have driven to a few lakes (but we'd got the boat for a week) maybe we should have taken Nuddy for an all-expenses-paid-week to show us how to do it?
Maybe in a few years I'll go sight seeing in Ireland & take the tackle for a hour or two of gentle angling but the reports of big boxes of fish labelled "Irish Bream" being sold regulary on Billingsgate fish market don't do much to inspire confidence.
I sincerely hope that no-one does as bad as we did and that things are on the up!