Need advice on my Rossi model 92 trapper

[Spentcase]

Hi, new greenhorn here, seeking wisdom.

I purchased a Rossi model 92 .357 three weeks ago, and have pull it apart and reassembled it almost a dozen times
to do the following:

Replaced the plastic magazine tube spring plug with a metal one.
Trimmed the mag tube spring to ease the tension for loading rounds.
Cut 1-2 coils off both the extractor and hammer spring.
Carefully trimmed the loading gate, and polished up the internals. 
Made sure my .38 and .357 rounds are at least 1.52 to 1.54 OAL.

The action is now slicker, and easier to load, but I still have occasional  jams, where one round seems to be slipping past the cartridge stop and bind with a round already on the carrier. I've removed and checked the cartridge stop, and the spring is in the right position, with no crud binding it or the stop.  I just went through loading and ejecting dummy .357 round (1.54 OAL) over 25 times, and experienced four of these jams, which is four too many for me.

My second problem is with the loading gate. I cannot achieve 8+1 status after loading up 8 rounds and chambering another round to allow another round to be loaded through the gate, as the gate locks up tight. Most of the time I can load more rounds in through the gate when down to four rounds--then sometimes the gate binds and I cannot.

Any advice would be appreciated. I don't expect to have a race gun, just one that will consistently feed a round every-time.

[pony express]

Is it new, or used? on mine the cartridge stop was worn, I built it up with welding and re-shaped it. It was letting a second round onto the carrier most of the time.

[Spentcase]

Brand new.

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[Sir Charles deMouton-Black]

Did it work before you tuned it?  Whoops! No warantee.