For those who want to go slightly faster (XL 300 @ 54 kph) while still able to trade big blows and run cool. For those willing to sink in the c-bills definitely worth the investment.
I run something similar, though I prefer the standard engine so I strip some leg armour, go with only a single jump jet and 2 SRM4's, bit sturdier than yours but works well, since I only use the JJ's for agility instead of popping then 1 works just fine.
I would run a XL325 in this build, mostly for the extra turn speed, and you still have 2JJ for those pesky hills and buildings. probably the best brawler for this mech. 5-5