Ahh, PA is probably swarming you pretty hard, and their ships are always many levels higher than yours so your starting capitals will melt, Lucres or not. As you said yourself, you'll need to hide behind your defensive walls until you get out your titans (as IR) or your fleet of New Class ships (as NR).
I play exclusively Emperor, and online with all matchups. The only really one-sided balance issue I found and expressed on the forum (taking faction matchups as whole, not comparing individual elements) was EoTH's ineffectual "ethos" (their supposed speed) in the Sins engine and thus their issues lategame. Corey addressed it a bit in the beta by extending EoTH weapons range.
Hence, if you really feel Lucres outclass ISD-Is and MC-80s too much for a starting capital, you can list the reasons why and I'm sure the devs will at least read it through.
My opinion of the Lucre is this: extra health wasted as a starting capital during the expansion stage when you really want to kill and expand fast, 2 weapons banks only means poor scaling with levels (and again, poor starting utility), but most importantly, lacking that one signature ability/abilities (Syndic's Cloak, Jump, and Megamaser, MC-80's Boarding Party, ISD-I's Mole Miners if you go Pallaeon) that scales it into the lategame (Bulwark is its "best" ability and it's already underwhelming). In my opinion, one of the worst starting capitals... which is fine because PA has one of the best starting frigates, the Arquitens.