Honestly if you are just bashing around, red springs on all 8 with 2 hole pistons and 40 weight oil will be just fine. If you watch my shock rebuild, I did put 3 hole up front with 40w and 2 hole in the rear with 40w due to the rear being heavier. I have yet to test this as life got in the way, but in theory, it will work better for jumps.
This is a *COMPLETE* Shock Rebuild Tutorial, So it is a very long video. Much longer than my usual videos. But I go through every single step of the process of rebuilding the shocks on this T-Maxx 2.5. If you want to see a step by step How-To on...
www.rc-help.com
If you are set on upgraded shocks, aluminum over plastic, I have heard good things about these below. They are available from multiple sellers online, this is just the first one I pulled up.
Hot Racing Traxxas T-Maxx Aluminum 100mm HD Big Bore Shocks are big bore threaded body aluminum shocks that fit the Traxxas T-Maxx, E Maxx, and... HRATD8100X06
www.hobbytown.com
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https://amzn.to/3rtDkeW