For those of you who get good results from a Leigh DT jig, what routers are you using?

I've been trying my hand at using a Leigh DT jig for the past several weekends. At this point, I've cut somewhere between 25 and 50 sets of dovetails, both half-blind and through. While my technique has improved, I still end up with excessively large gaps in about half the tests I've run. A 50% failure rate is too high risk ruining pieces that have been milled and cut to size for furniture projects, so I've got to improve this somehow.

After speaking with Barry, the tech support guy at Leigh, I think the gaps are caused by tilting the router slightly while cutting. I've used a PC 690 fixed-base router for some of the thru-DTs, and a Festool OF1000 for the rest of the thru DTs and all the half-blind DTs. What router would you suggest?

Thanks in advance.