You can cut at least 5 lands, plus you have 2 Boros Signet in there. Also, off the top of my head, you can probably cut Boros Swiftblade , Fencing Ace , and replace card:Inquisitor's Flail with Grappling Hook .
I'm going to suggest a lot of cards, since I have a Gisela deck myself: Gisela EDH. You don't have to add them all, it's just stuff to consider.
If you're running Sunforger, you should consider putting in some better tutor targets. You've got Path to Exile and Swords to Plowshares already, but consider adding some of the following: Return to Dust , Price of Progress , Second Sunrise /card:Faith's Reward, Volcanic Fallout , Oblation , Chaos Warp , Ghostway .
Gisela is really good with damage-based wipes, because if she's in play, they'll wipe your opponent's boards while leaving your creatures alone. So instead of Day of Judgment or Wrath of God , consider Inferno , Molten Disaster , Mizzium Mortars , or Brightflame .
Thank you, Folcon for a very clear and thought out response. I checked out your Gisela EDH and will probably be altering mine to match it a bit. I took all your suggestions to heart and altered my deck accordingly. Thanks!
Oh, two things I should point out. Heartless Hidetsugu will kill you if have any damage-doubler other than Gisela in play, and using Sunforger to cast card:Faith's Reward/Second Sunrise doesn't work after a complete board wipe, since Sunforger will already be unattached from a creature.
Overall, it's looking much better. Glad I was able to help.