Can you explain what you mean about the manual shift mechanism not being too tight?
I can have a go
Basically, the manual 4200 (Coupe GT) shift mechanism isn't the most precise feeling of shifts.
Sure, it'll get the car into gear, and it's a manual box so it does the job and ticks those boxes.
The ratios are the same as the CC since that's basically the same box with some hydraulic appendages, but a large part of the experience of a manual over any form of automation, for me anyway, is the feeling, and that's where the manual shift mechanism lets itself down a little.
It's lacking in that reassuring feeling you get with a very good gear shift, compared to something like an MX-5 which is short and direct, the loading a bolt action rifle sort of analogy, you don't really feel the gears engaging, there is clearly some play between the stick mechanism, the cables and probably the brackets on the gearbox too.
If we go all in ergonomics, it's in the wrong place too - you need pretty long arms to engage first gear for example.
I guess, it feels like you're moving a plastic stick around that's connected to 2 cables that control the gearbox, which of course you are, but you don't really want to feel like that's what you're doing, you want to feel like you're precisely selecting the cog of your choice, you want to feel that it's engaged, you want it to feel more mechanical.
I suppose it's similar to (though I've never used one) why that the old Ferrari open metal gate manuals are so well loved. I'd presume they aren't the best thing to use in terms of performance as I'd imagine it'd slow down the gear shifts, but I bet the sound of that clack-clack, and the precision feeling you get is incredibly ergonomically satisfying.