Default Fido lte

Good morning.. So I have a galaxy s3 unlocked from telus. I have been trying to get stable LTE on Fido and I can't seem to get it. I have tries everything from entering the service modes to flashing Odin stock but I can't seem to find stable LTE. I'm thinking I may flash the stock rogers ROM instead of the telus one but I'm not too sure that would help since they seem to use the same modem. Does anyone have any idea what I could do to get my LTE to work everywhere again. Even my network speeds on 3g/ h+ seem slow.

Thanks!

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