GA pilot reported that on a Visual Approach to CLW; a non-towered airport; they had to increase their rate of descent and airspeed to avoid PIE Class C airspace and overlying TPA Class B airspace.

Narrative

The reason for my report is to call attention to a situation that has occurred twice for me when flying into CLW from the north on an IFR flight plan. CLW is non-towered and requires a right pattern for landing on Runway 34. The airspace is in a Class B area of TPA and is also bordered by PIE Class C airspace. I was brought in at 3;000 feet by Tampa Approach. Then at four miles from the airport I was told to go to CTAF and report cancellation on the ground or the frequency I was on. The issue is that I was very high and had to rapidly descend to pattern altitude and below the Class B shelf and stay out of PIE airspace for the right base turn to Runway 34. The rate of descent created more speed which made the base turn tougher to stay out of PIE airspace. I asked the Approach Controller for OK to go in to PIE airspace to make the turn and he seemed confused by the request and so I proceeded to cancel IFR and make the right base.I was able to avoid PIE airspace; but the speed of the rapid descent and the tight right turn made the approach very difficult. Furthermore because CLW does not have a Tower; there are slower and smaller VFR airplanes in the pattern often; which make the IFR to VFR transition very tough. I have experienced this on two recent occasions where the same procedure was followed by Tampa Approach. As CLW is a training airport and has a very active flight school there is often a few airplanes in the pattern. Furthermore the school and local pilots often fly at around 3;000 feet on the approach path from the north into CLW; at this time the activity made it impossible for the Controller to descend me as there was training or sightseeing happening. There is no IFR approach into CLW nor an arrival. I think this area needs to be looked into to avoid possible accidents or Class B or C airspace violation issues. Also to prevent faster aircraft transitioning to VFR on CTAF from entering the pattern at a higher speed and altitude. Honestly; I feel CLW should have a Tower due to its proximity to these two very busy airspaces. Perhaps an arrival or even an instrument approach.