Keep failing at breeding Clydesdales and their crossbreeds

[Paelor]

Example of a foal just born



What am I doing wrong? What should I be looking for other than the basic requirements? Do I need a 5* eval on each parent?

[BlackOak2]

Example of a foal just born



What am I doing wrong? What should I be looking for other than the basic requirements? Do I need a 5* eval on each parent?

You linked a foal that isn't there anymore.

What exactly are you trying to do?
Here are some tips (I know you're probably following at least most or maybe all of these, I'm posting them for you so that you can go through the checklist again yourself).
For a clydesdale you will need to follow the recipe:
Belgian x Galloway to Friesian x Shire
So you won't be able to use something like a belgian x friesian for this recipe.
Your clydesdale foal must come out at or near (with some wiggle room) the following evaluation:
16.3 - 18.1 hands; medium to medium heavy build; as a Pony with body size of 50 - 75 and a body type of 50 - 75.
A belgian can be taller and heavier in all areas then the clydesdale.
A galloway is definitely shorter, but the other criteria can hit within the clydesdale requirements if you find a heavier one.
A friesian can be lighter, but if you find just the right heavy one, may just fall within the requirements of the clydesdale.
A shire can be heavier than the clydesdale, but nominally appears to fall right within the clydesdale requirements.
So your largest problems that should result from these breeds is being a little heavy on the belgian x galloway side and not much on the friesian x shire side.
Considering this recipe, if you allow the belgian to be a little heavier for your crossed foal and find a friesian that's a little lighter for your crossed foal, the resulting recipe may be just what you need. However, all of the genes that both sides carry will be at play in the recipe, so if the belgian has some really heavy genes that it carries that aren't expressed and it passes it on, they you could have a foal that's overweight for the clydesdale.
If you continue to have serious problems then you'll want to make your cross foals much more uniform, meaning that they'll continue to throw within the clydesdale requirements consistently and not outside the clydesdale requirements.

When you have another failed foal, run the evaluation on it and see what your recipe parents are throwing, is it too tall or too short? Is the body size outside of the 50 to 75 point requirement? Is the body type not within the 50 to 75 requirement? Your foal failed somewhere. If it meets all of these requirements then that means that pair can make the new foal, but that you didn't get the right flip of the coin. Try them again.

I hope this does help you. But if it doesn't, perhaps the community can take a closer look?