None of us really wish to cast a critical eye over either the drivers or the car, but just a few observations.
Anything over 250 bhp on a leaf spring rear axle is going to be tricky to control on the limit. This is where the SSL rear suspension kit helps A LOT, but other suspension mods are of course available . Dare I suggest this is why MMC introduced their coil sprung rear end?
My +8 was fine on dry smooth roads but it always felt slightly edgy and sometimes even twitchy under sub-optimal conditions (poor road surfaces, damp or muddy or contaminated roads). As a result I would reduce speed accordingly to try and balance the grip available. Now I have the SSL rear end I feel much more confident and I am happy for my wife to drive me under more challenging conditions.
Coming from a Morgan competition background also helps . From track experience I can feel when breakaway is imminent, and I try to make sure that I react accordingly. Sometimes I get it right , sometimes I don't, but I would like to think that the former outweighs the latter.
If you are used to today's cars with full electronic driver aids, you have to adopt a very different mindset when driving a Morgan fast. You need to feel for incipient brake lock-up and not just mash the pedal. You need sensitivity on the throttle to ensure you have enough grip to keep the car on your intended track. Yes it is fun to deliberately break rear end traction and then catch it again, but make sure you have the skill to ensure you apply just enough power to do this and not one NM of torque more.
Also I think it is useful to do some driver training on low friction surfaces. This Easter I am taking the whole family on a skid pan experience to give them the benefit of professional instruction on how to drive when grip is low to non-existent.