The phrase "a much more tricky" is not correct in standard English.
The correct form would be "much trickier" or "a much trickier."
Example: "This puzzle is much trickier than I expected."
Alternatives: "significantly more difficult" or "considerably more challenging."
Replacing Johnson's confidence, excitement, passion and influence -- championship-minded ingredients -- is a much more tricky challenge.
Trying to predict the outcome of an internal party election through polling is a much more tricky.
And even a clinician may find this type of inference difficult for those medications with a diverse set of therapeutic uses; being clear of the indication for the use of amitriptyline, whose primary use has been as an antidepressant but is now as likely to be used as an analgesic in postherpetic neuralgia or as a prophylactic against migraine, is a much more tricky task.
It's easy to love Downton Abbey and Game of Thrones, which wear their quality like an enormous corsage, but The Americans is spikier, much more tricky to embrace.
Efficient formulation of such simulations in a general programming language like C or FORTRAN, however, is not a trivial task: while simulating a few reactions is fast even with a simple implementation, a system with thousands of reactions and subvolumes demands more complex algorithms which are much more tricky to code.
Purification is much more tricky in Tbilisi -- and mice are just out of the question".
This operation is much more tricky: the tumor has woven itself around tendons and bones, and Richardson does not want to cut a simple rectangular flap in the skin to get access: doing this will make it more difficult to stitch back together and heal.
However, the calculation of accurate partition ratio coefficients is much more tricky for the specular condition applied on arbitrary geometrical borders.
Obviously, that would have been much more tricky to pull off than I'm suggesting.
