Good RP involves RPing not knowing where Vogtland is, and definitely not camping it or coming over to it just to "hunt a pirate". A few of the RNC cruisers floating around recently are guilty of that as well.
With that aside, let me tell you the reason you lost. The Rheinland unlawfuls know each other very well, due to the large skype chat we have that contains most of them, be it independent or faction players. This allows us a fairly good level of coordination, since we play a lot with each other. The reason why you lose whenever you join a fight is because you and the RM players do not know each other, don't train with each other, and hence lack the coordination. I have no doubts both of you perform better in your own teams rather than in mixed independent teams. Now if you want to win, then making your own "clan" is certainly not the way to do it, you will continue to lose that way. The proper way would be to actually join RM and get accustomed with them more...