There are recommended maximum heights for purlins and Girts. If you want more heights the options are increase cleat thickness ore change cleat profile to may be equal angle profile.
Expert steel detailers will know what to do and will use the appropriate thickness and profile
If you are using 8 mm plate cleat, you can go upto 150 mm max
Beyond that use an EA cleat
75×6 EA is good.
Increasing plate thickness may not be a good option because of PB30 bolt where the bolt length is only 30 mm.
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