hopefully i am wrong, but i don't know if there is anything you can do right now. from my experience, 7mos is just an awful age for sleep. teething, milestones, etc. mine were sleeping great @ around 4 months also, and then it started to deteriorate from about 6 months (when they started getting teeth).
i think you just need to do the best you can and power on through. skipping naps isn't going to help - they will just be more wound-up.
when one of mine did that wanting to play at night thing, i took him into the guest room with me, blocked off all of the edges of the bed, laid down and let him bop around while i rested. sometimes it worked, sometimes not, but at least that way i was laying down and not upright and frustrated in a rocking chair or something.
i don't want to bum you out - i just want to be honest - it kinda is what it is and it will improve in time, as those milestones get out of the way and the babes get a bit older. 6-11mos is notoriously bad. just do what you have to do to get everyone sleeping as well as possible, nap during the day if you can. there is a light at the end of the tunnel... power on through!!