Imperiale Racing duo Vito Postiglione and Kikki Galbiati closed to within just five points of the Lamborghini Super Trofeo points lead following a pair of dominant victories at the Nurburgring.
The Bonaldi Motorsport crew of Danny Kroes and Sergei Afanasiev continue to lead the championship ahead of the final two rounds at Jerez next month, but with a significantly reduced margin following a brace of third place finishes.
Kroes started Saturday's opening race from pole and led the sister Bonaldi car of Jack Bartholomew into the first corner.
Galbiati then got the better of Bartholomew and began closing in on Kroes approaching the mandatory driver-change pitstops.
A quicker stop from the Imperiale Racing crew allowed Postiglione - who had taken over from Galbiati - to emerge in the lead as Kroes handed over command of the #3 Bonaldi Huracan to Afanasiev.
From then on, Postiglione gradually extended his advantage at the front, setting successive fastest laps to ease to a 14.525 second win.
Alberto di Folco and Davide Venditti claimed the final step on the podium in third after a thrilling three-way battle with Afanasiev and Bartholomew's team-mate Stuart Middleton.
Former British GT4 driver Middleton had held onto third following the pitstops and seemed to have the measure of Di Folco and the Leipert Motorsport car of Anthony Lambert behind before he spun through the fast Schumacher Chicane.
Middleton did a full 360-degree spin but only dropped two places before finding his way back past Lambert on the final lap to finish fourth.
Harald Schlegelmilch took an easy Pro-Am victory with sixth overall in the ArtLine Team Georgia entry, driving without co-driver Shota Abkhazava for the opening encounter.
Schlegelmilch started from the back of the grid following qualifying issues and also received a jumped-start drivethrough penalty early-on.
In Sunday's second race, Postiglione got a perfect getaway from the rolling start, beating Middleton and Afanasiev into Turn 1, as further back Jose Collado tipped his fellow Am class runner Steven Liquorish into a spin.
This brought out the safety car for a solitary lap, with Postiglione able to build a comfortable three seconds margin over Middleton ahead of the stops.
Middleton managed to close the gap to Postiglione to just under two seconds by the time he made his stop, but the latter maintained a slender margin, which Galbiati would subsequently ease out to 5.707s by the flag after the stops.
Behind the leading duo, Afanasiev broke clear of a raging battle between Di Folco and Schlegelmilch - who was joined by Abkhazava - for fourth.
Di Folco leapfrogged Afanasiev following a slower stop for the #3 car, but Kroes was able to retake third.
Galbiati was untroubled en route to his and Postiglione's fourth win of the season - and second double after Misano - to move the pairing closer to Kroes and Afanasiev in the standings.
The battle for supremacy in the Am class was a weekend-long battle between AGS Events' Nico Gomar and Gilles Vannelet, and the GT3 Poland entry of Robert Zwinger.
Zwinger came out on top in the first race after the polesitting Leipert Motorsport car of Mikko Eskelinen and Jake Rattenbury lost ground after the pit stops.
Gomar led the second race early-on and kept ahead after the stops, with Zwinger eventually falling 16s behind by the end.