The hole for Clark seems to be being dug deeper and deeper all the time.
Yes, Lana does come off as someone who has some 'issues', especially with money and a sense of loss of control. But we all know that Lois is/was the ultimate control freak, and compromise was never in her lexicon until her relationship with Clark 'gentled' her behavior a bit.
Lois' inclusion at this point is interesting and the glimpse we see of her is consistant with her driven personality and her need to succeed. In Lois we see this as a positive attribute while in Lana it comes off as self-agrandising.
The bottom line, so far, is; as you've written her Lana does truly appear to love Clark and he her. They are not merely engaged, but have been married for a time now. Given the moral value system that Clark possesses, I believe that it will be difficult to come up with a scenario that will split Lana and Clark and push Lois and Clark together that doesn't seem forced, or artificial.
That's quite a challenge you've set for yourself as a writer. It will be interesting to see if you can pull it off.
Tank (who actually has faith that Terry can pull it off)
Clark should her ‘Bob’ on vacation to a cave, out of Lana’s reach. 
