Wow did not see that. The reactor has a slightly lower supercharged run time but it doesnt matter (due to it being a E class).
Edit: After examining the Mk: 5 section of the list I will come to share my design
http://www.talonfiremage.pwp.blueyonder.co.uk/reactorplanner…1501521s1r11r10
replace the (Edit: inner)coolent with isotope or vise versa to modify the stats. It remains (relitivley) stable.