So how will you know if you have your lpr set correctly if you are using the same set screw. There is a very clear way to tell when using the stock lpr cap, put the set scre flush with the end, or possible a turn or so in. The new lpr cap/pump guide is considerable longer making using the regular 1/4 set screw very hard to adjust to the correct spot.
A few possible solutions could be either including a long set screw that will replace the extra distance so you can set it flush with the end of the pump guide. Or possible making the guide in 2 pieces, 1 the same length as the stock lpr cap and the second screws into that to add the needed length.