Looking at building my arsenal - I know I need a ball for when lanes start breaking down during league play, or possibly a better benchmark ball.

Currently, I use Hammer No Mercy, and when lanes are fresh, I use LM/L NS2, Maxim for spares.

Considering a Morich Solid LevRg  or a Brunswick Python.

Thoughts on the above?  I believe Solid LevRg is a good benchmark ball - so is the Python?  (me thinks)

you might try a hy road or furious from storm or maybe a nomad solid from rotogrip.all have had good feedback as well as maybe an onyx vibe.
all these balls are vey good on the medium patterns or on the transition shot( the hyroad can be a bit strong tho depending on drilling but works great for me), dependent on drilling they should give you a good contollable arc on the back end.
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speed: 18mph at release and 16mph at pins
rev rate - 350
high game:279
high series:720
15lb balls -
legends yeah baby
hammer black widow
ebonite striking motion
storm hy-road
legends kong
Hammer Raw Burn
brunswick zone spare ball