Mike Stone's 'vark flight characteristics

I recently took Mikes F-111 for a spin after not flying it for a while and I had forgotten about it's tendency to climb uncontrollably, how do I fix this? I am fairly new at this kind of scripting.
Flight Simulator and other chat
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https://forums.simviation.com/phpBB3/viewtopic.php?f=13&t=33960