Leaf Blowers

I have a commercial property maintenance company and we have multiple ride-on power sweepers and sweeping trucks (Tymco 210's). All of our sweeper operators are equipped with backpack blowers to blow out corners, behind parking blocks, sidewalks, etc.

I cannot keep any make or model of backpack blowers running for more than a few days at a time! I have recently switched from Dolmar 4-stroke to the Husqvarna 150BT 2-strokes. The Husqvarnas started out strong but after about week to week and a half (approximately 70-80 hours of run-time) the motors are struggling, bogging down, losing power, etc. These blowers generally run 5-7 days per week and often 8-10 hours per night. The blowers that we use with our ride-on Powerboss power sweepers operate in a VERY dusty environment and they are generally run full throttle for hours at a time.

Question: can anyone PLEASE tell me what model Husqvarna blower I should try? There are so many listed on the Husqvarna website. What I need is a TRUE commercial blower. At $300-$400+ each I can't keep replacing these things every couple weeks.

Thank you, your feedback is greatly appreciated!