Shower drain

Hi, just had a new shower base insert installed by inner bath last monday.base had a smaller grate installed and was connected to waste via an adapter.since then I cant use my shower at full pressure as its too much water for waste to handle I can only use water at half pressure so water gets away.shower head produces around 27lts /min but base only takes away about 18lts/min.dont know if I have a small block in line and the prblem has been made more obvious via new base or if new base I installed has cut waste flow by that much? How much would it cost to have someone come out to give some advice?

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