I recently bought and installed the hi lift blade for my ego LM2100SP to help with pickup of Fall leaves. With this blade, the cutting and bagging have been great but I have lost control of the self propel speed - it stays at the fastest speed until the battery is close to needing recharge. Changing the speed control lever doesn’t slow the speed at all. I am basically stuck at high speed for most of the mowing. I haven’t yet switched back to the original blade to check the speed lever as I just got it back from sharpening. Any help and recommendations will be greatly appreciated.