Hello everyone.. "CC" is my Favorite site ...
I have a problem ... first of all I use a LARGE Lasagna Pan to make my sheet cakes in ... it usually takes over one hour to bake it ...

What do you suggest
1 - use a regular Pan
2. get a Heat Core

My cakes are moist but the edges are usually hard and have to be trimmed of course.

Thanks in advance for your help.

Do you have a flower nail? I have 2 of them and use them 1/3 and 2/3 into the length of the pan along the middle of course. Just grease them well and set them in the pan before batter, if you forget they can go in after batter is poured. These act as heating cores and make a very small hole in your cake which is easy to cover. I also bake my cakes 25 degrees lower but for longer, learned this from a pastry chef. I gives you an evenly baked cake and it's nice and tender. You can also use Wilton's 'bake even' strips and you don't have to turn your oven temp down.

Do you have a flower nail? I have 2 of them and use them 1/3 and 2/3 into the length of the pan along the middle. Just grease them well and set them in the pan before batter, if you forget they can go in after the batter is poured. These act as heating cores and make a very small hole in your cake which is easy to cover. I also bake my cakes 25 degrees lower but for longer, learned this from a pastry chef. I gives you an evenly baked cake and it's nice and tender, or you can use Wilton's 'bake even' strips and you don't have to turn your oven temp down.

A pan's a pan. The same size (all three dimensions) cake won't bake any faster in a pan that comes from the baking department.

Heating core(s), lower temperature.

Lots of us have baked in large pans If your edges are hard and must be cut off then you need to use the wet towels wrapped around the pan (outside) to help keep it cool until the center bakes enough.
I have baked 16" rounds and 12x18x2 sheets w/o using any kind of heat core or even a flower nail. Bake at a lower temp.......no more than 325...even 300 until you can smell the cake......yuuuummmm chocolate cake! - it must be done