The 34mm piston is ideally suited to the 19 pump , the 19x20 ratio you would think would of been the best option . I have been told , the 19 RCS pump will provide best all out stopping power for the Brembo 32mm piston calipers I run , but for feel I currently run / chose the 17 RCS with bigger rotors . The lever feel is great for trailing braking , then full on braking , but what I mean is there is a broad range of take up on my 17 pump , mild to wild . From initial pull on lever milder with a lot of feel feed back , the 19 is said to not give that same feedback . I have a 19 ready to try ,but am waiting to put on later in year .
I have however found the distance of lever position can be a factor , but only experienced this acutely on a clutch RCS on my last GSXR11 . As example , It needed to be adjusted out a long way to compensate for early clutch take up .
The remote adjuster you can buy that cable attaches to the brake pump ( Brembo , TWM pictured ) , is put there to adjust lever out to compensate for brake fade sometimes experienced in racing , so lever position .
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It looks like you are running 2 lines , 1 line from each of the calipers , up to pump , 2 banjos connections separated by 2 crush washers , same as I run , so pretty straight forward , should of been routine to bleed up .
Maybe there is a air lock bubble somewhere , that initially has minimal effect until the pump is really worked , this has happened to others and extremely frustrating , in which case you have to persevere . I guess you have done the zip tie the lever pulled into bar , overnight , then crack the bleeder on the pump , but I mention anyway . Also , you have inspected the caliper completely I guess , checked / replaced the seals etc. as necessary .
I guess you are running a pressure switch on your pump for brake light , I think sometimes cheap manufactured pieces , but if no leaks anywhere all should be good . Always comes back to air lock block that is moving around fairly freely , in my opinion .
