I have a 155mm pump on my 1100 blaster, I recommend doing the pump show, mine wasn't done originally and i had a lot of problems with it cavatating. after i replaced the shoe it ran like a dream.
The one that is bogging down is probably a pump leak by the pump shoe, i had the same issue with my Blaster 1. i took the pump out in my case i needed a new pump shoe but it might just need to be resealed.
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