You simply do not have enough return capacity to run on high heat. You need another return to increase capacity. Look at Appendix E.
http://www.graycoolingman.com/uploads/1/0/6/6/10667336/58mvp-_2_stage_variable_speed_troubleshoot_guide.pdf
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74 Targa 3.0, 89 Carrera, 04 Cayenne Turbo
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