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Graham, well you've laid a good foundation by starting with the front air dam and splitter, hence the stability you have already noticed, even with a B/j car, it's the front that needs the work first, even with the much maligned ( unjustly) swing axles, the rear on both IRS and swing, is easy to get right, the reason the rear engined GT3 Porsches are so good in LMS and FIA Endurance racing with virtually no rear aero/diffuser/downforce, (flat engine layout =no room) is the already high rear loadings over the mid and front engined types with more room at the back for large diffusers, wheel loads are good to start with, tho there isn't much to choose between the three layouts, front, mid and rear engined, the advantage swings each season, maybe front engine, BMW, Corvette, Aston, were there at the season start last year, now we see Risi Ferrari holding the aces, tho it's so so close, and we know Porsche have a new car for this year...
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