Being genuine can work here. Are you actually prepared to turn the offer down. If so, turn the offer down and see if they come back with something better. In terms of dealing with the recruiter, you should have a handle by now as to whether the recruiter has any influence or is prepared to fight your corner. Make a judgement call here. If it is a reasonably senior role, you should by now have a direct line to your potential manager and you can play this card as a last resort. Also, assess the company. A few years ago, when the market got tougher and redundancies were commonplace, it was those who had pushed too hard at the start who lost their jobs. Realistically, things are looking quite stable now so if you want this to be a longer term option, you need to push through any channel you realistically can. You need to understand the system. Sometimes ,you cannot increase the basic salary because this would take you into a different grade but you can secure various add-ons (sign on, guaranteed bonus, additional allowances of various kinds, hardship subsidy for excessive travel...). You should have an inside track by now through which you can find out the gradings and understand what can be achieved.