the Jody Jazz HR* 6 is my favourite 'Meyer type' mouthpiece for alto - had one for about 5 years now - £65 from Howarths way back when, they're probably nearly twice that now, but still a good mouthpiece for the money. And i've tried a few...
I've never had a genuine Meyer to compare it to, but it's probably a bit brighter and more 'freeblowing' - which seems to be the tendency with most of the modern 'Meyer influenced' mouthpieces. My guess is that any improvements to the rollover baffle to make it blow easier also result in a bit more brightness - although from a distance of a few meters, any extra brightness is likely to be hardly noticeable - the sound we hear as players, close up to the instrument and with the reed vibrating in our mouth, isn't the same as what the audience hears.
I've not tried the other Jody Jazz mouthpieces, but if the quality is as good as the HR* then they're worth checking out.
The 'Classic' seems to be an improved Runyon Custom and that's a pretty good mouthpiece to start off with - all the Runyon's I've got are excellent. The spoiler is a bit of a fiddle, but makes things brighter and more aggressive, but as with a lot of high baffle/small chamber pieces, it makes the low end less easy to blow - but that could just be me... most people don't bother with the spoiler
the hard reed to soft reed transition is something I used to do - practise with a 4 for 20 minutes then put on a 3 and it was like taking the brakes off... it's not something I'd encourage, maybe it helped with building my embouchure, but practising for 4 hours with a loud drummer was what really got my chops into shape. Nowadays I use softer reeds and get more control...