400 carbs heating

[Hydroglen]

Some time ago I asked for help in solving a vapour lock problem and I received a number of suggestions. In addition, Bellerophon came up with the fact that the head may be clogged with sediment.
All is OK and the problem persists.
This is what happens:
Car starts well when cold and drives well under ALL temp conditions, even on the hottest days and in traffic.
I stop for fuel and it starts right up again. A fuel stop being some 5 minutes?
If I stop for much longer or go in to a shop/restaurant it is a real issue to get going again.
The SU carbs are so hot that I can't hold on to them for long.

The only way I solve the problem is by raising the hood/bonnet and then all is well.

I have removed the inner fender panel on the exhaust side, but no difference.
Previous suggestions included fuel pump issues. For those not familiar with a400 the fuel is gravity fed to the pump and the pump is on the cool side of the engine so no problem there.

I was going to use spacers under the carbs but there is not much room. The studs / nuts are flush and even if I replaced them with longer ones there is a bit of a height issue with the hood. Also I would have to redo all the copper lines. Can do...but since I seem to be the only one with this issue, what are the suggestions??
Thanks
Dorien Berteletti