Not a problem. Enniscoe house has a website and link with contact details for fishing so you might be able to get him from that or maybe the guest house might be able to point you in the right direction for boat hire.
Fishing In Mayo | Angling Breaks Ireland | Mayo Fishing | Mayo Accommo
I haven't been out at the northern end myself but I do know Ian Wise, Cloonamoyne Fishery, Enniscoe did do boats up around there but maybe not anymore. Gerry might put in a boat in for you further up the lake as he i know he does move boats about to other lakes in the area. Hope that helps.
I haven't fished it in a long time but some of the best spots were Quinn's, Church Island, Moorehall, Casltecarra, Kilkeeran shore, the twins.
There was a very good article in Total Flyfisher magazine a year or two ago by Tom Doc Sullivan about fishing the lake in July - i might still have it...
No trips on Conn this year yet unfortunately. Hope to get a trip out with then next 2 weeks. That's a new one to me as well and also Flannerys bay that is mentioned. Not on any maps of the lake I have.
An email to the fisheries office and Declan who puts up the report might have some...