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My son's bike has a Shimano Mega Range 14-34T freewheel, it's the Shimano Tourney MF-TZ31. It's a 7-speed freewheel, with 14-16-18-20-22-24-34T cogs.

I'm thinking of upgrading the stock rear derailleur, a Shimano Tourney RD-TY300-SGS:
https://bike.shimano.com/en-EU/product/component/tourney/RD-TY300-SGS.html

It doesn't work consistently well with the low (34T) cog. The low regulation screw has to be almost removed. Still alignment under the low cog is not perfect. So I need to increase cable tension, but then shifting to the high cogs is worse.

Furthermore, I'd rather have a short cage (GS) derailleur, being the bike small.

The shifter is a Shimano Revoshift SL-RS36-6R:
https://bike.shimano.com/en-EU/product/component/tourney/SL-RS36-6R.html

What would you suggest?
 

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TX55. My son's Felt came stock with a TX55, it's a short cage and works with the 7spd megarange. No troubles shifting into the big gear out back. I also upgraded to SL-M310 shifters, dirt cheap and gets the kiddo used to triggers.
 
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