How can I prevent my honey cake from splitting open?
Effectively what's happening is that the outer crust is forming before the inside has finished rising.  This is the exact reason with a yeast bread that you would slice the loaf before baking, so that we can control how the crust breaks.  (as it wouldn't break on its own, it's too strong).

In the case of a cake or quick bread, you don't have gluten, so although the crust doesn't have a lot of tensile strength.  As such, if you have sufficient internal pressure, the top will split as the inside continues to expand.

The solution is the same as the problem with too much doming -- you have to find a way to get the outside to not set before the inside has finished setting.

... but in this case, I don't know that I'd turn down the temperature.  If the cake is going to be stacked and decorated, sure, as it makes a more dense cake that's actually more condusive to stacking.

If it were to be served sliced, like you might with a poundcake for strawberry shortcake, I'd be more likely to turn up the temperature to try to get the characteristic split that you get our of a poundcake or banana bread, as it'll give you a lighter internal crumb.

If you wanted to try to avoid the cracking, as that shape of pan isn't really conducive to cooling strips, I'd place the pan on the bottom 1/3 of the oven, and place a sheet of aluminum foil or a sheet pan on the rack above it to reduce radiant cooking from above.