You will want to stick with those or exact replacements, as you noticed the spray pattern and angle is designed specifically for the intake port. Try sending them to a company that will flow test them and recondition like this place http://injector-rehab.com/shop/. You don't mention the year of your bike or if you've tried to solve the low speed "issues" within tuning it out within the ECM. The bike is all stock? You've had it for a while and know it was better in that area from previous experience? Changed up the exhaust or air filter etc...?